The shell edits the line it is given

Three different things used to do this job, and which one you got depended on
where the machine was running. On a terminal the host held the line and did the
echoing and the backspacing; behind a window the console's own gatherer did it;
from a file nothing did it at all. One job, three implementations, none of them
in the system - which is why there was no way to move about in a line and
nowhere for a history to live.

So editLine does it. Key mode while a line is being read and line mode straight
after, so nothing else in the system and no program calling osReadLine notices
anything changed. Left and Right, Home and End, Backspace for the character
before the cursor and Delete for the one under it, and anything typed goes in
where the cursor is with the rest of the line moving along.

Ctrl-D means the end of input again, on an empty line, because that was a thing
the terminal did while it was holding the line and it is not holding it now.
Same trade as the echoing.

MOST KEYSTROKES DRAW NOTHING BUT THEMSELVES. A character typed at the end of a
line needs no cursor moved: printing it is the whole change, and a backspace
there is three ordinary bytes. That matters beyond speed - moving the cursor by
hand is what a terminal is TOLD about, in an escape sequence, so redrawing on
every keypress would fill every recorded transcript in this suite with them.
The line is only reprinted when something happened in the middle of it.

Where the line STARTS is worked out backwards from where printing ended, rather
than trusted from what was remembered. That is what makes it survive the screen
scrolling: a line printed on the bottom row moves everything up by one, and a
remembered row would be one too low from then on.

The command line holds 127 characters, up from 63. The limit started to be felt
the moment a line could be moved about in.

58 recordings changed, and every one of them by the echo. THE PROOF IS NOT A
HEURISTIC: a CosmOS built with the echo silenced reproduces 187 of the 188
recordings byte for byte. The one exception is cosmosTyped, the backspace test,
where the rub-out marks now come from the shell instead of from the console's
gatherer - same marks, different author.

cosmosEditKeys is the new test, and every line in it is typed wrong and then
corrected with a different key. Its last line is eighty six characters at a
prompt in column two on an eighty column screen, so the line runs onto the row
below and the shell has to find the start of something it can no longer see;
breaking either half of that arithmetic fails it.

Also: agree.sh looked for "> the same", anchored to a prompt that no longer
precedes what a command prints.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW

Programs/CosmOS/README.md

@@ -283,6 +283,37 @@ facility and as a test that CosmOS correctly restores its Stack and vector table
 every run; and `load` is how the monitor puts an arbitrary file in front of itself, which
 is a thing typing a name deliberately cannot do.
 
+### Typing A Line:
+
+The shell reads what you type a key at a time and edits the line itself, which is why the
+line can be moved about in at all.
+
+| Key | What it does |
+| -- | -- |
+| Left, Right | Move a character. |
+| Home, End | Go to the start of the line or the end of it. |
+| Backspace | Take out the character before the cursor. |
+| Delete | Take out the one under it. |
+| Return | Finish the line, wherever the cursor happens to be sitting. |
+
+Anything typed goes in where the cursor is, so a word left out of the middle of a line is
+put back by moving there and typing it, and the rest of the line moves along.
+
+**This used to be three different things depending on where the machine was running.** On a
+terminal the host held the line and did the echoing and the backspacing; behind a window the
+console's own gatherer did it; from a file nothing did it at all. One job, three
+implementations, and none of them here - which is why there was no way to move about in a
+line, and nowhere for a history to live. Now the console delivers keys and says nothing
+about what they mean, the same way it reports what a drive is and says nothing about what
+should be on it, and the shell decides.
+
+The line holds 127 characters. It held 63 until the shell could edit one, which is when the
+limit started to be felt: a copy between two disks with a directory on each is most of the
+way there before anything has been said.
+
+Everything else that reads a line - an application calling `osReadLine`, the editor - is
+unchanged and still gets a plain line with no editing in it.
+
 ### Paths:
 
 Everywhere CosmOS takes a filename it will take a path: names with `/` between them,

Programs/CosmOS/Source/cosmos.asm

@@ -188,7 +188,7 @@ promptWhere:
   ;
   ; So shellReadLine says it. It is the one place that knows.
   SETD.0 CommandLine
-  INIB 0d63
+  INIB 0d127
   CALL shellReadLine
 
   ; Running out of typing is how this ends. It is not the same as an empty line, which is
@@ -389,7 +389,7 @@ shellReadQuiet:
 
 shellReadTyped:
   CALL sayPrompt
-  CALL readLine
+  CALL editLine
   RET
 
 ; ---- The same, for a caller that prints a prompt of its own ----
@@ -411,7 +411,512 @@ shellReadRaw:
 shellReadRawQuiet:
   RET
 shellReadRawTyped:
-  CALL readLine
+  CALL editLine
+  RET
+
+; ---- The line the person at the keyboard is typing ----
+;
+; THREE DIFFERENT THINGS USED TO DO THIS JOB and which one you got depended on where the
+; machine was running. On a terminal the host held the line and did the echoing and the
+; backspacing; behind a window the console's own gatherer did it; from a file nothing did it
+; at all. One job, three implementations, and none of them here - which is why there was no
+; way to move about in a line and nowhere for a history to live.
+;
+; So the shell does it. The console delivers keys and says nothing about what they mean, the
+; same way the disk says what a drive is and nothing about what should be on it. Where the
+; cursor goes and what the line looks like afterwards are decisions, and decisions belong to
+; whoever is reading.
+;
+; DP0 names a buffer and B says how many characters it holds, not counting the zero byte
+; that ends it. Q is how long the line turned out to be. That is readLine's bargain exactly,
+; so this drops in where that was called.
+;
+; ConsoleEndOfInput is set if the console ran out instead of a line being finished, which is
+; readLine's other promise and the one the shell uses to know when to stop.
+;
+; ---- Why most keystrokes draw nothing but themselves ----
+;
+; A character typed at the END of a line needs no cursor moved: printing it is the whole of
+; the change. That is the case almost every keystroke is, and it matters beyond speed -
+; moving the cursor by hand means writing the console's cursor registers, which a terminal
+; is told about in an escape sequence. Redrawing on every keypress would fill every recorded
+; transcript in the test suite with them. So the cheap path is the common one, and the line
+; is only reprinted when something happened in the middle of it.
+editLine:
+  SETD.1 EditBase
+  STD.0.1
+  SETD.1 EditRoom
+  STB.1
+
+  RSTA
+  SETD.1 EditLength
+  STA.1
+  SETD.1 EditAt
+  STA.1
+  SETD.1 ConsoleEndOfInput
+  STA.1
+
+  ; Where the line begins, ASKED rather than assumed. The prompt has just been printed and
+  ; only the console knows where it left off.
+  INA 0x03
+  SETD.1 EditRow
+  STA.1
+  INA 0x04
+  SETD.1 EditColumn
+  STA.1
+
+  ; How wide the screen is, which is what decides where a long line carries on. A machine
+  ; with nothing on that port answers zero, and a width of zero would make the walking below
+  ; never finish, so it is taken as the width this system asks for at boot.
+  INA 0x32
+  BNA editWidthKnown
+  INIA 0d80
+editWidthKnown:
+  SETD.1 EditWidth
+  STA.1
+
+  ; Key mode, with the cursor the shell keeps. Nothing echoes from here on: everything that
+  ; appears below is put there by this routine.
+  INIA 0x05
+  OUTA 0x02
+
+editKey:
+  INA 0x00
+  SETD.1 EditChar
+  STA.1
+
+  ; The ways out first, since they leave rather than change anything. XOR leaves the answer
+  ; in Q and A alone, so one read stands for the whole ladder.
+  INIB 0x0A
+  XOR
+  BRQ editDone
+  INIB 0x0D
+  XOR
+  BRQ editDone
+  INIB 0xFF
+  XOR
+  BRQ editEnded
+
+  ; ---- And the key that means there is no more ----
+  ;
+  ; Ctrl-D, which the terminal used to turn into the end of input all by itself and cannot any
+  ; more: that is a thing a terminal does while it is holding the line, and it is not holding
+  ; it now. So the shell does it, which is the same trade as the echoing and the backspacing.
+  ;
+  ; ONLY ON AN EMPTY LINE, which is the rule everywhere else it appears. In the middle of
+  ; something typed it means neither "stop" nor a character, so it means nothing.
+  INIB 0x04
+  XOR
+  BNQ editNotEnd
+  SETD.1 EditLength
+  LDB.1
+  BRB editEnded
+editNotEnd:
+
+  INIB 0x08
+  XOR
+  BRQ editBack
+  INIB 0x86
+  XOR
+  BRQ editDelete
+  INIB 0x82
+  XOR
+  BRQ editLeft
+  INIB 0x83
+  XOR
+  BRQ editRight
+  INIB 0x84
+  XOR
+  BRQ editHome
+  INIB 0x85
+  XOR
+  BRQ editEnd
+
+  ; Anything else is a character if it is printable and nothing at all if it is not. The
+  ; console's own keys that this shell has no use for land here and are ignored rather than
+  ; typed, which is the whole reason they are above ASCII.
+  INIB 0x20
+  CCF
+  SUB
+  BRC editKey
+  INIB 0x7F
+  CCF
+  SUB
+  BNC editKey
+
+; ---- Putting a character in ----
+editInsert:
+  SETD.1 EditLength
+  LDA.1
+  SETD.1 EditRoom
+  LDB.1
+  CCF
+  SUB
+  BNC editKey               ; Full. The zero byte on the end is not counted in the room.
+
+  ; A hole at the insertion point, made from the top down so nothing is overwritten before
+  ; it has been moved.
+  SETD.1 EditLength
+  LDA.1
+  SETD.1 EditAt
+  LDB.1
+  CCF
+  SUB
+  MVQB                      ; How many characters are above the insertion point.
+  SETD.1 EditBase
+  LDD.0.1
+  SETD.1 EditLength
+  LDA.1
+  DPUA.0                    ; One past the last character.
+editInsertShift:
+  BRB editInsertPut
+  DECD.0
+  LDA.0
+  INCD.0
+  STA.0
+  DECD.0
+  DECB
+  BRI editInsertShift
+editInsertPut:
+  SETD.1 EditChar
+  LDA.1
+  STA.0
+
+  SETD.1 EditLength
+  LDA.1
+  INCA
+  STA.1
+  SETD.1 EditAt
+  LDA.1
+  INCA
+  STA.1
+
+  ; At the end of the line, printing it IS the change.
+  SETD.1 EditLength
+  LDB.1
+  CCF
+  SUB
+  BNQ editInsertRedraw
+  SETD.1 EditChar
+  LDA.1
+  OUTA 0x00
+  BRI editKey
+editInsertRedraw:
+  CALL editRedraw
+  BRI editKey
+
+; ---- Taking one out ----
+;
+; Backspace and Delete are different keys doing different things: one takes the character
+; BEFORE the insertion point, the other the one under it. They meet at editTakeOut, which is
+; the only part they share.
+editBack:
+  SETD.1 EditAt
+  LDA.1
+  BRA editKey               ; Nothing before it. Rubbing out past the start of the line
+                            ; would eat the prompt, which belongs to whoever printed it.
+  DECA
+  STA.1
+
+  ; Whether that was the last character decides how it disappears, and it has to be asked
+  ; before the buffer shortens under it.
+  SETD.1 EditLength
+  LDB.1
+  DECB
+  CCF
+  SUB
+  BNQ editBackMiddle
+
+  CALL editTakeOut
+  ; Rubbed out where it stands, which is what a terminal has always done for a backspace: no
+  ; cursor moved by hand, and so nothing said to the terminal but three ordinary bytes.
+  INIA 0x08
+  OUTA 0x00
+  INIA 0x20
+  OUTA 0x00
+  INIA 0x08
+  OUTA 0x00
+  BRI editKey
+editBackMiddle:
+  CALL editTakeOut
+  CALL editRedraw
+  BRI editKey
+
+editDelete:
+  SETD.1 EditAt
+  LDA.1
+  SETD.1 EditLength
+  LDB.1
+  CCF
+  SUB
+  BRQ editKey               ; Nothing under the cursor at the end of a line.
+  CALL editTakeOut
+  CALL editRedraw
+  BRI editKey
+
+; Takes the character at the insertion point out of the buffer and shortens it. Draws
+; nothing: what that should look like is the caller's business and the two callers disagree.
+editTakeOut:
+  SETD.1 EditBase
+  LDD.0.1
+  SETD.1 EditAt
+  LDA.1
+  DPUA.0
+  SETD.1 EditLength
+  LDA.1
+  SETD.1 EditAt
+  LDB.1
+  CCF
+  SUB
+  MVQB
+  DECB                      ; One of those is the character going.
+editTakeOutShift:
+  BRB editTakeOutDone
+  INCD.0
+  LDA.0
+  DECD.0
+  STA.0
+  INCD.0
+  DECB
+  BRI editTakeOutShift
+editTakeOutDone:
+  SETD.1 EditLength
+  LDA.1
+  DECA
+  STA.1
+  RET
+
+; ---- Moving about in it ----
+;
+; Nothing on the screen changes, so nothing on the screen is redrawn: only the cursor moves.
+editLeft:
+  SETD.1 EditAt
+  LDA.1
+  BRA editKey
+  DECA
+  STA.1
+  BRI editShow
+
+editRight:
+  SETD.1 EditAt
+  LDA.1
+  SETD.1 EditLength
+  LDB.1
+  CCF
+  SUB
+  BRQ editKey               ; Already at the end.
+  SETD.1 EditAt
+  LDA.1
+  INCA
+  STA.1
+  BRI editShow
+
+editHome:
+  RSTA
+  SETD.1 EditAt
+  STA.1
+  BRI editShow
+
+editEnd:
+  SETD.1 EditLength
+  LDA.1
+  SETD.1 EditAt
+  STA.1
+editShow:
+  SETD.1 EditAt
+  LDA.1
+  CALL editPlace
+  BRI editKey
+
+; ---- The end of a line, and the end of the typing ----
+editEnded:
+  INIA 0x01
+  SETD.1 ConsoleEndOfInput
+  STA.1
+  ; AND NO NEWLINE. Nobody pressed Return, so there is no line to end: the console simply
+  ; stopped having anything to say. Printing one here pushes whatever is said next down a row
+  ; for a reason nobody could see, which is what it did until this line was written.
+  BRI editFinish
+editDone:
+  ; The newline belongs after the whole line, not after wherever the cursor was left sitting.
+  ; Asked first, because a line finished at its end - which is almost every line - needs no
+  ; cursor moved and so says nothing to the terminal.
+  SETD.1 EditAt
+  LDA.1
+  SETD.1 EditLength
+  LDB.1
+  CCF
+  SUB
+  BRQ editDoneEnd
+  LDA.1
+  CALL editPlace
+editDoneEnd:
+  CALL newLine
+editFinish:
+
+  ; Line mode, with the cursor still on: that is how boot left the console and how every
+  ; program that knows nothing of any of this expects to find it.
+  INIA 0x04
+  OUTA 0x02
+
+  SETD.1 EditBase
+  LDD.0.1
+  SETD.1 EditLength
+  LDA.1
+  DPUA.0
+  RSTA
+  STA.0                     ; The zero byte that ends it.
+
+  SETD.1 EditLength
+  LDA.1
+  RSTB
+  CCF
+  ADD                       ; Q is how long the line is.
+  RET
+
+; ---- Putting the line back on the screen ----
+;
+; The whole of it, every time, rather than the part that changed. A hundred and twenty odd
+; characters is nothing to this machine, and the alternative is four separate cases that all
+; have to agree about what is already up there.
+editRedraw:
+  SETD.1 EditRow
+  LDA.1
+  OUTA 0x03
+  SETD.1 EditColumn
+  LDA.1
+  OUTA 0x04
+
+  SETD.1 EditBase
+  LDD.0.1
+  SETD.1 EditLength
+  LDB.1
+editRedrawNext:
+  BRB editRedrawTail
+  LDA.0
+  OUTA 0x00
+  INCD.0
+  DECB
+  BRI editRedrawNext
+editRedrawTail:
+  ; One space after it. A line that has just got shorter has a character left over on the
+  ; end, and printing over it costs less than working out whether there is one.
+  INIA 0x20
+  OUTA 0x00
+
+  CALL editAnchor
+  SETD.1 EditAt
+  LDA.1
+  CALL editPlace
+  RET
+
+; ---- Where the line starts, worked out backwards ----
+;
+; The console has just been told to print, so it knows where printing ENDED, and the line
+; began that many characters before it. Asking afterwards rather than trusting what was
+; remembered is what makes this survive the screen SCROLLING: a line printed on the bottom
+; row moves everything up by one, and a remembered row would be one too low from then on.
+editAnchor:
+  INA 0x03
+  SETD.1 EditWalkRow
+  STA.1
+  INA 0x04
+  SETD.1 EditWalkColumn
+  STA.1
+  SETD.1 EditLength
+  LDA.1
+  INCA                      ; The space was printed too.
+  SETD.1 EditWalkBack
+  STA.1
+editAnchorWalk:
+  SETD.1 EditWalkColumn
+  LDA.1
+  SETD.1 EditWalkBack
+  LDB.1
+  CCF
+  SUB
+  BRC editAnchorRowUp       ; Further back than this row goes.
+  MVQA
+  SETD.1 EditWalkColumn
+  STA.1
+  BRI editAnchorDone
+editAnchorRowUp:
+  ; Off the front of this row, so take what the row used and carry on along the one above.
+  SETD.1 EditWalkBack
+  LDA.1
+  SETD.1 EditWalkColumn
+  LDB.1
+  INCB                      ; The column itself, and the step onto it.
+  CCF
+  SUB
+  MVQA
+  SETD.1 EditWalkBack
+  STA.1
+  SETD.1 EditWidth
+  LDA.1
+  DECA
+  SETD.1 EditWalkColumn
+  STA.1
+  SETD.1 EditWalkRow
+  LDA.1
+  BRA editAnchorTop
+  DECA
+  STA.1
+  BRI editAnchorWalk
+editAnchorTop:
+  ; The line began off the top of the screen, which means more was scrolled away than the
+  ; line is long. There is nothing sensible left to point at, so it starts in the corner.
+  RSTA
+  SETD.1 EditWalkColumn
+  STA.1
+editAnchorDone:
+  SETD.1 EditWalkRow
+  LDA.1
+  SETD.1 EditRow
+  STA.1
+  SETD.1 EditWalkColumn
+  LDA.1
+  SETD.1 EditColumn
+  STA.1
+  RET
+
+; A says how many characters along the line the cursor belongs. Puts it there, carrying onto
+; the rows below when the line is longer than one row of the screen.
+editPlace:
+  SETD.1 EditColumn
+  LDB.1
+  CCF
+  ADD
+  MVQA
+  SETD.1 EditWalkColumn
+  STA.1
+  SETD.1 EditRow
+  LDA.1
+  SETD.1 EditWalkRow
+  STA.1
+editPlaceWrap:
+  SETD.1 EditWalkColumn
+  LDA.1
+  SETD.1 EditWidth
+  LDB.1
+  CCF
+  SUB
+  BRC editPlaceDone         ; Inside the row.
+  MVQA
+  SETD.1 EditWalkColumn
+  STA.1
+  SETD.1 EditWalkRow
+  LDA.1
+  INCA
+  STA.1
+  BRI editPlaceWrap
+editPlaceDone:
+  SETD.1 EditWalkRow
+  LDA.1
+  OUTA 0x03
+  SETD.1 EditWalkColumn
+  LDA.1
+  OUTA 0x04
   RET
 
 ; ---- A command that did not work ----
@@ -4776,9 +5281,45 @@ DirSize:
 WidthLeft:
   0x00
 
-; Sixty three characters and the zero byte that ends them.
+; ---- What a line being typed is made of ----
+;
+; All of it lives here rather than being passed about, because the routine that reads a line
+; is a loop over keystrokes and there are four Data Pointers, two of which it needs for the
+; buffer and the walking.
+EditBase:
+  0x00 0x00
+EditRoom:
+  0x00
+EditLength:
+  0x00
+EditAt:
+  0x00
+EditRow:
+  0x00
+EditColumn:
+  0x00
+EditWidth:
+  0x00
+EditChar:
+  0x00
+
+; Where the counting up and down the rows has got to. Separate from EditRow and EditColumn,
+; which are where the LINE starts: one of the two things that reads these is working out
+; that very answer, and a walk that wrote its intermediate steps into its own starting point
+; would be walking away from a moving mark.
+EditWalkRow:
+  0x00
+EditWalkColumn:
+  0x00
+EditWalkBack:
+  0x00
+
+; A hundred and twenty seven characters and the zero byte that ends them. It was sixty three
+; until the shell learned to edit a line, which is when the limit started to be felt: a copy
+; between two disks with a directory on each is most of the way there before anything has
+; been said, and the line can now be moved about in, so a long one is worth having.
 CommandLine:
-  #Reserve 0d64
+  #Reserve 0d128
 
 #Vectors
 

SplitBit Test Manual.md

@@ -79,7 +79,7 @@ from `make`, not from here.
 ### 1. Recorded output
 
 `Tests/run.sh` assembles each program named in `Tests/manifest`, runs it, and compares
-everything it printed against a file in `Tests/expected`. 188 tests, of which 126 run, 35
+everything it printed against a file in `Tests/expected`. 189 tests, of which 127 run, 35
 only assemble, 16 are expected to fail to assemble, and 11 boot from ROM with no image
 given at all.
 

Tests/agree.sh

@@ -169,7 +169,10 @@ if cmp -s toCopy.dat copiedBack.dat; then
 else
     report FAIL "large native copy" "the host read back different bytes"
 fi
-if grep -q '^> the same$' copied.txt; then
+# Not anchored to a prompt any more. The shell echoes the line it was given and then ends
+# it, so what a command prints now starts at the beginning of a line instead of following
+# the "> " that asked for it.
+if grep -q '^the same$' copied.txt; then
     report ok "native compare" "the streamed files agree"
 else
     report FAIL "native compare" "Compare did not call the copied files equal"

Tests/expected/cfgFallback.out

@@ -2,15 +2,20 @@ stage two
 no /System/Boot/missing.bin
 trying the fallback
 CosmOS
-> saved it
+> Files
+saved it
 read it back, 22 bytes:
 a file kept by asking
 renamed it
 deleted it
 and it is gone
 finished
-> made
+> mkdir Notes
-> /Notes> 0 files
+made
-/Notes> halted
+> cd Notes
+/Notes> dir
+0 files
+/Notes> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmos.out

@@ -1,5 +1,6 @@
 CosmOS
-> dir          list what is on the disk
+> help
+dir          list what is on the disk
 load <file>  read a program off the disk
 run [words]  start what was loaded, and tell it those words
 <name> [words]       look where you are and then in /Apps, and start that
@@ -14,7 +15,8 @@ rename <file> <to>   call it something else
 monitor      look at memory, change it, and jump into it
 help         this
 exit         stop, or leave the monitor if you are in it
-> greeting.txt            17
+> dir
+greeting.txt            17
 filler1.txt             8
 filler2.txt             8
 filler3.txt             8
@@ -27,7 +29,10 @@ across.txt              700
 empty.txt               0
 aName22CharactersLong!  22
 12 files
-> > I do not know: frobnicate
+> 
-> halted
+> frobnicate
+I do not know: frobnicate
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosBigDir.out

@@ -1,6 +1,8 @@
 CosmOS
 no filesystem on the disk
-> no filesystem on the disk
+> dir
-> halted
+no filesystem on the disk
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosBlankDisk.out

@@ -1,6 +1,9 @@
 CosmOS
-> drive: nothing this can read is in that drive
+> drive 1
-> 0
+drive: nothing this can read is in that drive
-> halted
+> drive
+0
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosBreak.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load Break.sbx
-> two stops, and what the registers were at each
+loaded, starting at 4000
+> run
+two stops, and what the registers were at each
 break at 4016
 A 11 B 22 Q 00 status 00 
 DP0 2030 DP1 2000 DP2 2037 DP3 4000 SP FFFF
@@ -11,6 +13,7 @@ DP0 2000 DP1 2037 DP2 2030 DP3 4000 SP FFF5
 press a key 
 carried on to the end
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosBuild.out

@@ -1,27 +1,50 @@
 CosmOS
-> 0 files
+> dir
-> made
+0 files
-> made
+> mkdir Apps
-> made
+made
-> Apps                    <dir>
+> mkdir Apps/Deep
+made
+> mkdir Notes
+made
+> dir
+Apps                    <dir>
 Notes                   <dir>
 0 files, 2 directories
-> /Apps> Deep                    <dir>
+> cd Apps
+/Apps> dir
+Deep                    <dir>
 0 files, 1 directory
-/Apps> cannot make that: check the path, the name, and whether it is taken
+/Apps> mkdir Deep
-/Apps> made
+cannot make that: check the path, the name, and whether it is taken
-/Apps> /Notes> Deep                    <dir>
+/Apps> mkdir /Notes/Deep
+made
+/Apps> cd /Notes
+/Notes> dir
+Deep                    <dir>
 0 files, 1 directory
-/Notes> cannot remove that: it must be a directory, and empty
+/Notes> rmdir /Apps
-/Notes> removed
+cannot remove that: it must be a directory, and empty
-/Notes> that is a directory
+/Notes> rmdir /Apps/Deep
-/Notes> removed
+removed
-/Notes> > cannot make that: check the path, the name, and whether it is taken
+/Notes> delete /Apps
-> cannot remove that: it must be a directory, and empty
+that is a directory
-> cannot remove that: it must be a directory, and empty
+/Notes> rmdir /Notes/Deep
-> removed
+removed
-> removed
+/Notes> cd /
-> 0 files
+> mkdir Apps/Deep/Inner
-> halted
+cannot make that: check the path, the name, and whether it is taken
+> rmdir Apps/Deep/Inner
+cannot remove that: it must be a directory, and empty
+> rmdir Apps/Deep
+cannot remove that: it must be a directory, and empty
+> rmdir Apps
+removed
+> rmdir Notes
+removed
+> dir
+0 files
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosClaim.out

@@ -1,10 +1,13 @@
 CosmOS
-> claiming more than was reserved was refused
+> Claim
+claiming more than was reserved was refused
 and the size it really came to was taken
 finished
-> Claim.sbx               580
+> dir
+Claim.sbx               580
 claim.dat               266
 2 files
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosCopyCompare.out

@@ -1,30 +1,44 @@
 CosmOS
-> copied
+> Copy /Input/empty.dat /Output/empty.dat
+copied
 finished
-> the same
+> Compare /Input/empty.dat /Output/empty.dat
+the same
 finished
-> copied
+> Copy /Input/exact.dat /Output/exact.dat
+copied
 finished
-> the same
+> Compare /Input/exact.dat /Output/exact.dat
+the same
 finished
-> copied
+> Copy /Input/tail.dat /Output/tail.dat
+copied
 finished
-> the same
+> Compare /Input/tail.dat /Output/tail.dat
+the same
 finished
-> copied
+> Copy /Input/large.dat /Output/large.dat
+copied
 finished
-> the same
+> Compare /Input/large.dat /Output/large.dat
+the same
 finished
-> different
+> Compare /Input/large.dat /Input/different.dat
+different
 finished
-> copy: cannot find the source
+> Copy /Input/missing.dat /Output/missing.dat
+copy: cannot find the source
 finished
-> compare: cannot find the second file
+> Compare /Input/large.dat /Input/missing.dat
+compare: cannot find the second file
 finished
-> copy: give me a source and destination
+> Copy
+copy: give me a source and destination
 finished
-> compare: give me two files
+> Compare /Input/large.dat
+compare: give me two files
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosCrossDisk.out

@@ -1,11 +1,18 @@
 CosmOS
-> > copied
+> drive 1
+> Copy 1:/twoblocks.txt 0:/crossed.txt
+copied
 finished
-> 1
+> drive
-> it says: from drive one
+1
+> Say from drive one
+it says: from drive one
 finished
-> 1
+> drive
-> > greet.sbx               211
+1
+> cd 0:/
+> dir
+greet.sbx               211
 hello.sbx               53
 Life.sbx                1396
 Snake.sbx               2164
@@ -26,6 +33,7 @@ inner.script            44
 loop.script             35
 crossed.txt             560
 19 files, 1 directory
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosCwd.out

@@ -1,36 +1,56 @@
 CosmOS
-> Apps                    <dir>
+> dir
+Apps                    <dir>
 A                       <dir>
 B                       <dir>
 0 files, 3 directories
-> /A> Say.sbx                 53
+> cd /A
+/A> dir
+Say.sbx                 53
 notes.txt               25
 2 files
-/A> these are the notes in A
+/A> Type notes.txt
-finished
-/A> /B> and these are the very different notes in B
-finished
-/B> it says: reached the one in Apps
-finished
-/B> /A> Hello, World!
-finished
-/A> > Apps                    <dir>
-A                       <dir>
-B                       <dir>
-0 files, 3 directories
-> /B> these are the notes in A
-finished
-/B> moved, and reading a bare name from there:
 these are the notes in A
 finished
-/B> and these are the very different notes in B
+/A> cd /B
+/B> Type notes.txt
+and these are the very different notes in B
 finished
-/B> no such file
+/B> Say reached the one in Apps
-/B> that is not a directory
+it says: reached the one in Apps
-/B> > Apps                    <dir>
+finished
+/B> cd /A
+/A> Say reached the one in A
+Hello, World!
+finished
+/A> cd ..
+> dir
+Apps                    <dir>
 A                       <dir>
 B                       <dir>
 0 files, 3 directories
-> halted
+> cd /B
+/B> Type ../A/notes.txt
+these are the notes in A
+finished
+/B> Wander /A
+moved, and reading a bare name from there:
+these are the notes in A
+finished
+/B> Type notes.txt
+and these are the very different notes in B
+finished
+/B> cd nosuchplace
+no such file
+/B> cd notes.txt
+that is not a directory
+/B> cd /
+> dir
+Apps                    <dir>
+A                       <dir>
+B                       <dir>
+0 files, 3 directories
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosDeep.out

@@ -1,5 +1,14 @@
 CosmOS
-> /abcdefghijklmnopqrst01> /abcdefghijklmnopqrst01/abcdefghijklmnopqrst02> /abcdefghijklmnopqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03> /abcdefghijklmnopqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04> /abcdefghijklmnopqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05> ...opqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06> ...opqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06/abcdefghijklmnopqrst07> ...opqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06/abcdefghijklmnopqrst07/abcdefghijklmnopqrst08> dir          list what is on the disk
+> cd abcdefghijklmnopqrst01
+/abcdefghijklmnopqrst01> cd abcdefghijklmnopqrst02
+/abcdefghijklmnopqrst01/abcdefghijklmnopqrst02> cd abcdefghijklmnopqrst03
+/abcdefghijklmnopqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03> cd abcdefghijklmnopqrst04
+/abcdefghijklmnopqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04> cd abcdefghijklmnopqrst05
+/abcdefghijklmnopqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05> cd abcdefghijklmnopqrst06
+...opqrst01/abcdefghijklmnopqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06> cd abcdefghijklmnopqrst07
+...opqrst02/abcdefghijklmnopqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06/abcdefghijklmnopqrst07> cd abcdefghijklmnopqrst08
+...opqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06/abcdefghijklmnopqrst07/abcdefghijklmnopqrst08> help
+dir          list what is on the disk
 load <file>  read a program off the disk
 run [words]  start what was loaded, and tell it those words
 <name> [words]       look where you are and then in /Apps, and start that
@@ -14,6 +23,8 @@ rename <file> <to>   call it something else
 monitor      look at memory, change it, and jump into it
 help         this
 exit         stop, or leave the monitor if you are in it
-...opqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06/abcdefghijklmnopqrst07/abcdefghijklmnopqrst08> > halted
+...opqrst03/abcdefghijklmnopqrst04/abcdefghijklmnopqrst05/abcdefghijklmnopqrst06/abcdefghijklmnopqrst07/abcdefghijklmnopqrst08> cd
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosDrivePath.out

@@ -1,9 +1,20 @@
 CosmOS
-> /notes> 1
+> cd 1:/notes
-/notes> > 0
+/notes> drive
-> /2things> 1
+1
-/2things> > /2things> 1
+/notes> cd 0:/
-/2things> no such file
+> drive
-/2things> halted
+0
+> cd 1:/2things
+/2things> drive
+1
+/2things> cd /
+> cd 2things
+/2things> drive
+1
+/2things> cd 9:/
+no such file
+/2things> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosDrives.out

@@ -1,6 +1,8 @@
 CosmOS
-> 0
+> drive
-> greet.sbx               211
+0
+> dir
+greet.sbx               211
 hello.sbx               53
 Life.sbx                1396
 Snake.sbx               2164
@@ -20,12 +22,21 @@ outer.script            376
 inner.script            44
 loop.script             35
 18 files, 1 directory
-> > other.txt               28
+> drive 1
+> dir
+other.txt               28
 notes                   <dir>
 2things                 <dir>
 twoblocks.txt           560
 2 files, 2 directories
-> /notes> > /notes> > /notes> drive: this machine has no such drive
+> cd /notes
-/notes> halted
+/notes> drive 0
+> drive 1
+/notes> drive 0
+> drive 1
+/notes> drive 3
+drive: this machine has no such drive
+/notes> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosEdit.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load Edit.sbx
-> poem.txt, new file
+loaded, starting at 4000
+> run poem.txt
+poem.txt, new file
 > : : : : > : : > 1: alpha
 2: INSERTED
 3: beta
@@ -10,12 +12,14 @@ CosmOS
 3: beta
 > written, 22 bytes
 > finished
-> poem.txt, 3 lines
+> run poem.txt
+poem.txt, 3 lines
 > 1: CHANGED
 2: INSERTED
 3: beta
 > there is no such line
 > finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosEditKeys.out

@@ -0,0 +1,17 @@
+CosmOS
+> eco okecho ok 
+ok
+> Xecho okecho ok 
+ok
+> echo ok
+ok
+> echo okX 
+ok
+> echo kecho ok 
+ok
+> Xecho aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaecho aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa !
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa!
+> exit
+halted
+Execution halted.
+[exit 0]

Tests/expected/cosmosEditLong.out

@@ -1,14 +1,20 @@
 CosmOS
-> hello.asm, 31 lines
+> Edit hello.asm
+hello.asm, 31 lines
 > finished
-> hello.asm, 31 lines
+> Edit hello.asm
+hello.asm, 31 lines
 > finished
-> the last program left 0, which is: it did what it was asked
+> Status
+the last program left 0, which is: it did what it was asked
 finished
-> a line in it is longer than this can edit, so it has not been opened
+> Edit long.txt
+a line in it is longer than this can edit, so it has not been opened
 finished
-> the last program left 1, which is: it did not
+> Status
+the last program left 1, which is: it did not
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosFiles.out

@@ -1,17 +1,26 @@
 CosmOS
-> one.txt                 13
+> dir
+one.txt                 13
 two.txt                 14
 2 files
-> renamed
+> rename one.txt first.txt
-> first.txt               13
+renamed
+> dir
+first.txt               13
 two.txt                 14
 2 files
-> gone
+> delete first.txt
-> two.txt                 14
+gone
+> dir
+two.txt                 14
 1 file
-> no such file
+> delete first.txt
-> rename what to what?
+no such file
-> there is no such file, or that name is taken
+> rename two.txt
-> halted
+rename what to what?
+> rename two.txt two.txt
+there is no such file, or that name is taken
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosGrid.out

@@ -1,10 +1,15 @@
 CosmOS
-> it says: before Grid
+> Say before Grid
+it says: before Grid
 finished
-> finished
+> Grid
-> > it says: after Grid
+finished
+> 
+> Say after Grid
+it says: after Grid
 finished
-> greet.sbx               211
+> dir
+greet.sbx               211
 hello.sbx               53
 Life.sbx                1396
 Snake.sbx               2164
@@ -24,6 +29,7 @@ outer.script            376
 inner.script            44
 loop.script             35
 18 files, 1 directory
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosHello.out

@@ -1,9 +1,13 @@
 CosmOS
-> loaded, starting at 4000
+> load hello.sbx
-> Hello, World!
+loaded, starting at 4000
+> run
+Hello, World!
 finished
-> Hello, World!
+> run
+Hello, World!
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosInvoke.out

@@ -1,22 +1,33 @@
 CosmOS
-> it says: hello there
+> Say hello there
+it says: hello there
 finished
-> it says: spelled out in full
+> Say.sbx spelled out in full
+it says: spelled out in full
 finished
-> it says: once more
+> run once more
+it says: once more
 finished
-> Say.sbx                 156
+> dir
+Say.sbx                 156
 dir.sbx                 156
 notes.txt               21
 notes.sbx               21
 4 files
-> not a program
+> notes
-> not a program
+not a program
-> I do not know: notes.txt
+> notes.sbx
-> I do not know: nosuchprogram
+not a program
-> I do not know: abcdefghijklmnopqr
+> notes.txt
-> I do not know: abcdefghijklmnopqrs
+I do not know: notes.txt
-> dir          list what is on the disk
+> nosuchprogram
+I do not know: nosuchprogram
+> abcdefghijklmnopqr
+I do not know: abcdefghijklmnopqr
+> abcdefghijklmnopqrs
+I do not know: abcdefghijklmnopqrs
+> help
+dir          list what is on the disk
 load <file>  read a program off the disk
 run [words]  start what was loaded, and tell it those words
 <name> [words]       look where you are and then in /Apps, and start that
@@ -31,6 +42,7 @@ rename <file> <to>   call it something else
 monitor      look at memory, change it, and jump into it
 help         this
 exit         stop, or leave the monitor if you are in it
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosKeys.out

@@ -1,19 +1,29 @@
 CosmOS
-> loaded, starting at 4000
+> load Keys.sbx
-> keys, by interrupt. q stops.
+loaded, starting at 4000
+> run
+keys, by interrupt. q stops.
 ab
 the console has been handed back
 finished
-> > keys, by interrupt. q stops.
+> 
+> run
+keys, by interrupt. q stops.
 cd
 the console has been handed back
 finished
-> > x examine, d disassemble, a assemble, s set, b bank, g go, exit leaves
+> 
-* bank 00
+> monitor
-* FE00  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
+x examine, d disassemble, a assemble, s set, b bank, g go, exit leaves
+* b program
+bank 00
+* x fe00
+FE00  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 FE10  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 FE20  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 FE30  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
-* > halted
+* exit
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosLife.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load Life.sbx
->   #             
+loaded, starting at 4000
+> run
+  #             
    #            
  ###            
                 

Tests/expected/cosmosLifeKey.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load Life.sbx
->   #             
+loaded, starting at 4000
+> run
+  #             
    #            
  ###            
                 
@@ -19,7 +21,8 @@ CosmOS
 
 stopped
 finished
-> > 
+> 
+> 
 halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosMonitor.out

@@ -1,10 +1,16 @@
 CosmOS
-> x examine, d disassemble, a assemble, s set, b bank, g go, exit leaves
+> monitor
-* b <program|data|number>
+x examine, d disassemble, a assemble, s set, b bank, g go, exit leaves
-* there is no such bank
+* b nonsense
-* loaded, starting at 4000
+b <program|data|number>
-* bank 00
+* b 9
-* 4000  47 00 20 00  SETD.0 2000
+there is no such bank
+* load greet.sbx
+loaded, starting at 4000
+* b program
+bank 00
+* d 4000
+4000  47 00 20 00  SETD.0 2000
 4004  72 10        SWI 10
 4006  47 00 20 44  SETD.0 2044
 400A  72 10        SWI 10
@@ -12,23 +18,32 @@ CosmOS
 4010  27 1F        INIB 1F
 4012  72 11        SWI 11
 4014  47 00 20 5D  SETD.0 205D
-* 4000  47 00 20 00 72 10 47 00 20 44 72 10 47 00 20 7A  G. .r.G. Dr.G. z
+* x 4000
+4000  47 00 20 00 72 10 47 00 20 44 72 10 47 00 20 7A  G. .r.G. Dr.G. z
 4010  27 1F 72 11 47 00 20 5D 72 10 47 00 20 7A 72 10  '.r.G. ]r.G. zr.
 4020  47 00 20 65 72 10 20 72 12 00 00 00 00 00 00 00  G. er. r........
 4030  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
-* bank 01
+* b data
-* 2000  61 20 70 72 6F 67 72 61 6D 2C 20 6C 6F 61 64 65  a program, loade
+bank 01
+* x 2000
+2000  61 20 70 72 6F 67 72 61 6D 2C 20 6C 6F 61 64 65  a program, loade
 2010  64 20 6F 66 66 20 61 20 64 69 73 6B 2C 20 72 75  d off a disk, ru
 2020  6E 6E 69 6E 67 20 6F 6E 20 74 68 65 20 73 79 73  nning on the sys
 2030  74 65 6D 20 74 68 61 74 20 6C 6F 61 64 65 64 20  tem that loaded 
-* bank 02
+* b 2
-* 0000  01 FF 00 00 00 00 00 00 01 FF 00 00 00 00 00 00  ................
+bank 02
+* x 0
+0000  01 FF 00 00 00 00 00 00 01 FF 00 00 00 00 00 00  ................
 0010  03 FF 08 00 00 00 00 00 01 20 01 00 00 00 00 00  ......... ......
 0020  00 FF 00 00 00 00 00 00 00 FF 00 00 00 00 00 00  ................
 0030  00 FF 00 00 00 00 00 00 00 FF 00 00 00 00 00 00  ................
-* that bank will not be written
+* s 0 FF
-* bank 00
+that bank will not be written
-* * 8000  26 48        INIA 48
+* b program
+bank 00
+* s 8000 26 48 D1 00 26 0A D1 00 18 12
+* d 8000
+8000  26 48        INIA 48
 8002  D1 00        OUTA 00
 8004  26 0A        INIA 0A
 8006  D1 00        OUTA 00
@@ -36,7 +51,8 @@ CosmOS
 8009  12           AND
 800A  00       ?
 800B  00       ?
-* Fault: 0x00 at Program Address 0x800A is not an instruction.
+* g 8000Fault: 0x00 at Program Address 0x800A is not an instruction.
+
 H
 Execution halted.
 [exit 1]

Tests/expected/cosmosMore.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load More.sbx
-> first line
+loaded, starting at 4000
+> run readable.txt
+first line
 second line
 line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
@@ -24,7 +26,8 @@ line 18: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 19: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 -- more --
 finished
-> first line
+> run readable.txt
+first line
 second line
 line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
@@ -58,7 +61,8 @@ line 27: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 28: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 29: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 finished
-> first line
+> run readable.txt
+first line
 second line
 line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
@@ -84,6 +88,7 @@ line 19: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 20: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 -- more --
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosNoDisk.out

@@ -1,6 +1,7 @@
 CosmOS
 no filesystem on the disk
-> no filesystem on the disk
+> dir
+no filesystem on the disk
 > 
 halted
 Execution halted.

Tests/expected/cosmosPress.out

@@ -1,5 +1,6 @@
 CosmOS
-> a line, then keys. q stops.
+> Press
+a line, then keys. q stops.
 61 62 63 64 
 keys:
 80 up
@@ -8,6 +9,8 @@ keys:
 5A Z
 done
 finished
-> > halted
+> 
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosPressKeys.out

@@ -1,5 +1,6 @@
 CosmOS
-> a line, then keys. q stops.
+> Press
+a line, then keys. q stops.
 61 62 63 64 
 keys:
 80 up
@@ -8,6 +9,8 @@ keys:
 5A Z
 done
 finished
-> > halted
+> 
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosRamDisk.out

@@ -1,10 +1,16 @@
 CosmOS
-> > 0 files
+> drive 1
-> copied
+> dir
+0 files
+> Copy 0:/Say.sbx 1:/Say.sbx
+copied
 finished
-> Say.sbx                 156
+> dir
+Say.sbx                 156
 1 file
-> 1
+> drive
-> halted
+1
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosRun.out

@@ -1,6 +1,8 @@
 CosmOS
-> nothing is loaded
+> run
-> greet.sbx               211
+nothing is loaded
+> dir
+greet.sbx               211
 hello.sbx               53
 Life.sbx                1396
 Snake.sbx               2164
@@ -20,16 +22,23 @@ outer.script            376
 inner.script            44
 loop.script             35
 18 files, 1 directory
-> load what?
+> load
-> no such file
+load what?
-> not a program
+> load nosuch.sbx
-> loaded, starting at 4000
+no such file
-> a program, loaded off a disk, running on the system that loaded it
+> load notes.txt
+not a program
+> load greet.sbx
+loaded, starting at 4000
+> run
+a program, loaded off a disk, running on the system that loaded it
 what should I call you? hello, Anachronaut. that is all I do.
 finished
-> a program, loaded off a disk, running on the system that loaded it
+> run
+a program, loaded off a disk, running on the system that loaded it
 what should I call you? hello, Claude. that is all I do.
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosSay.out

@@ -1,11 +1,16 @@
 CosmOS
-> loaded, starting at 4000
+> load Say.sbx
-> nothing was said
+loaded, starting at 4000
+> run
+nothing was said
 finished
-> it says: notes.txt
+> run notes.txt
+it says: notes.txt
 finished
-> it says: a longer thing with spaces
+> run a longer thing with spaces
+it says: a longer thing with spaces
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosScript.out

@@ -1,5 +1,6 @@
 CosmOS
-> > echo saying what it is doing
+> do hi.script
+> echo saying what it is doing
 saying what it is doing
 > Say from a script
 it says: from a script
@@ -9,6 +10,7 @@ finished
 > Say and again
 it says: and again
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosScriptBad.out

@@ -1,13 +1,18 @@
 CosmOS
-> > Say before
+> do bad.script
+> Say before
 it says: before
 finished
 > nosuchcommand
 I do not know: nosuchcommand
 stopped: that line did not work
-> do: that is not a script - it wants #! on the first line
+> do plain.script
-> do: cannot find it
+do: that is not a script - it wants #! on the first line
-> do: give me the name of a script
+> do nothere.script
-> halted
+do: cannot find it
+> do
+do: give me the name of a script
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosScriptEdges.out

@@ -1,10 +1,13 @@
 CosmOS
-> > Say across the block boundary
+> do cross.script
+> Say across the block boundary
 it says: across the block boundary
 finished
-> > Say with no newline after me
+> do nonl.script
+> Say with no newline after me
 it says: with no newline after me
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosScriptNest.out

@@ -1,5 +1,6 @@
 CosmOS
-> > echo outer in block one
+> do outer.script
+> echo outer in block one
 outer in block one
 > do inner.script
 > echo   inner one
@@ -8,7 +9,8 @@ inner one
 inner two
 > echo outer resumed in block one
 outer resumed in block one
-> > echo self
+> do loop.script
+> echo self
 self
 > do loop.script
 > echo self
@@ -22,6 +24,7 @@ self
 > do loop.script
 do: scripts are only four deep
 stopped: that line did not work
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosServices.out

@@ -1,12 +1,15 @@
 CosmOS
-> loaded, starting at 4000
+> load Files.sbx
-> saved it
+loaded, starting at 4000
+> run
+saved it
 read it back, 22 bytes:
 a file kept by asking
 renamed it
 deleted it
 and it is gone
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosSettle.out

@@ -1,8 +1,10 @@
 CosmOS
 this is the fallback: what boot.cfg asks for did not start
-> the disk says the last start did not arrive, so this is the fallback
+> Settle
+the disk says the last start did not arrive, so this is the fallback
 settled: the next start will use the configuration again
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosSettled.out

@@ -1,6 +1,8 @@
 CosmOS
-> already settled: the next start will use the configuration
+> Settle
+already settled: the next start will use the configuration
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosSlowDisk.out

@@ -1,5 +1,6 @@
 CosmOS
-> greet.sbx               211
+> dir
+greet.sbx               211
 hello.sbx               53
 Life.sbx                1396
 Snake.sbx               2164
@@ -19,9 +20,12 @@ outer.script            376
 inner.script            44
 loop.script             35
 18 files, 1 directory
-> loaded, starting at 4000
+> load Say.sbx
-> it says: the disk took its time
+loaded, starting at 4000
+> run the disk took its time
+it says: the disk took its time
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosSnake.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load Snake.sbx
-> +----------------+
+loaded, starting at 4000
+> run
++----------------+
 |                |
 |                |
 |                |

Tests/expected/cosmosSource.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load readTest.sbx
-> ; This is a basic hello world program for the SplitBit CPU.
+loaded, starting at 4000
+> run hello.asm
+; This is a basic hello world program for the SplitBit CPU.
 ; We'll create a loop that outputs each byte of our string to Output 0, the text console.
 
 #Program
@@ -22,6 +24,7 @@ End:
 "Hello, World!"
 ---- lines: 21
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosStartup.out

@@ -4,7 +4,10 @@ CosmOS ready.
 > echo and loud again
 and loud again
 and quiet again at the end
-> > typed by hand
+> clear
-> halted
+> echo typed by hand
+typed by hand
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosStartupBad.out

@@ -1,6 +1,9 @@
 CosmOS
 startup.sh is there but does not begin with #!, so it was not run
-> > typed by hand
+> clear
-> halted
+> echo typed by hand
+typed by hand
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosStatus.out

@@ -1,16 +1,23 @@
 CosmOS
-> it says: it worked
+> Say it worked
+it says: it worked
 finished
-> the last program left 0, which is: it did what it was asked
+> Status
+the last program left 0, which is: it did what it was asked
 finished
-> type: give me a file name
+> Type
+type: give me a file name
 finished
-> the last program left 2, which is: it was asked wrongly
+> Status
+the last program left 2, which is: it was asked wrongly
 finished
-> type: cannot find the file, error 2
+> Type /nothing/here.txt
+type: cannot find the file, error 2
 finished
-> the last program left 1, which is: it did not
+> Status
+the last program left 1, which is: it did not
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosStream.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load Stream.sbx
-> big.txt is 329 blocks
+loaded, starting at 4000
+> run
+big.txt is 329 blocks
 read 329 blocks, checksum 57368, stopped with 3
 small.txt streamed is 15216, read whole is 15216
 the same
@@ -11,6 +13,7 @@ the new name answers 0
 a name that was never there answers 2
 a block past the end answers 3
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosTokens.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load tokenTest.sbx
-> 4  keyword 0 [#Program]
+loaded, starting at 4000
+> run hello.asm
+4  keyword 0 [#Program]
 6  label:  0 [Start:]
 7  instr   2 [LDA]
 8  instr   1 [BRA]
@@ -20,6 +22,7 @@ CosmOS
 20  string  14 [Hello, World!]
 ---- no more tokens
 finished
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosTree.out

@@ -1,30 +1,49 @@
 CosmOS
-> Apps                    <dir>
+> dir
+Apps                    <dir>
 rooted.txt              21
 1 file, 1 directory
-> loaded, starting at 4000
+> load /Apps/Say.sbx
-> it says: the shallow one
+loaded, starting at 4000
+> run the shallow one
+it says: the shallow one
 finished
-> loaded, starting at 4000
+> load /Apps/Deep/Say.sbx
-> Hello, World!
+loaded, starting at 4000
+> run the deep one
+Hello, World!
 finished
-> loaded, starting at 4000
+> load /Apps/./Deep/../Say.sbx
-> it says: the shallow one again
+loaded, starting at 4000
+> run the shallow one again
+it says: the shallow one again
 finished
-> loaded, starting at 4000
+> load /Apps/Deep/../../Apps/./Deep/Say.sbx
-> Hello, World!
+loaded, starting at 4000
+> run the deep one the long way round
+Hello, World!
 finished
-> no such file
+> load /rooted.txt/Say.sbx
-> no such file
+no such file
-> that is a directory
+> load /Apps/Missing/Say.sbx
-> no such file
+no such file
-> no such file
+> load /Apps
-> no such file
+that is a directory
-> that is a directory
+> load /Apps/abcdefghijklmnopqrstuvw
-> gone
+no such file
-> Apps                    <dir>
+> load /
+no such file
+> load /Apps/Deep/../..
+no such file
+> delete /Apps
+that is a directory
+> delete /Apps/Deep/Say.sbx
+gone
+> dir
+Apps                    <dir>
 rooted.txt              21
 1 file, 1 directory
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosTreeWrite.out

@@ -1,15 +1,20 @@
 CosmOS
-> Folder                  <dir>
+> dir
+Folder                  <dir>
 Edit.sbx                2243
 1 file, 1 directory
-> loaded, starting at 4000
+> load Edit.sbx
-> note.txt, new file
+loaded, starting at 4000
+> run note.txt
+note.txt, new file
 > : : : > written, 67 bytes
 > finished
-> Folder                  <dir>
+> dir
+Folder                  <dir>
 Edit.sbx                2243
 note.txt                67
 2 files, 1 directory
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosType.out

@@ -1,6 +1,8 @@
 CosmOS
-> loaded, starting at 4000
+> load Type.sbx
-> first line
+loaded, starting at 4000
+> run readable.txt
+first line
 second line
 line 00: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 01: ABCDEFGHIJKLMNOPQRSTUVWXYZ
@@ -33,11 +35,15 @@ line 27: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 28: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 line 29: ABCDEFGHIJKLMNOPQRSTUVWXYZ
 finished
-> finished
+> run empty.txt
-> type: cannot find the file, error 2
 finished
-> type: give me a file name
+> run missing.txt
+type: cannot find the file, error 2
 finished
-> halted
+> run
+type: give me a file name
+finished
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/cosmosTyped.out

@@ -1,5 +1,6 @@
 CosmOS
-> dir          list what is on the disk
+> halp   melp    elp
+dir          list what is on the disk
 load <file>  read a program off the disk
 run [words]  start what was loaded, and tell it those words
 <name> [words]       look where you are and then in /Apps, and start that
@@ -14,6 +15,7 @@ rename <file> <to>   call it something else
 monitor      look at memory, change it, and jump into it
 help         this
 exit         stop, or leave the monitor if you are in it
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/onceAsked.out

@@ -1,9 +1,12 @@
 CosmOS
-> next start: /System/Boot/bare.bin, once
+> Once /System/Boot/bare.bin
+next start: /System/Boot/bare.bin, once
 finished
-> System                  <dir>
+> dir /System/Boot
+System                  <dir>
 Apps                    <dir>
 0 files, 2 directories
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/rebootDirect.out

@@ -1,6 +1,8 @@
 CosmOS
-> starting again
+> Reboot
+starting again
 CosmOS
-> halted
+> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/rebootOnce.out

@@ -1,8 +1,10 @@
 stage two
 CosmOS
-> next start: /System/Boot/bare.bin, once
+> Once /System/Boot/bare.bin
+next start: /System/Boot/bare.bin, once
 finished
-> starting again
+> Reboot
+starting again
 stage two
 just this once: /System/Boot/bare.bin
 bare metal: no system, just this

Tests/expected/romBoot.out

@@ -1,14 +1,19 @@
 stage two
 CosmOS
-> saved it
+> Files
+saved it
 read it back, 22 bytes:
 a file kept by asking
 renamed it
 deleted it
 and it is gone
 finished
-> cannot make that: check the path, the name, and whether it is taken
+> mkdir Notes
-> /Notes> 0 files
+cannot make that: check the path, the name, and whether it is taken
-/Notes> halted
+> cd Notes
+/Notes> dir
+0 files
+/Notes> exit
+halted
 Execution halted.
 [exit 0]

Tests/expected/selfBoot.out

@@ -1,14 +1,19 @@
 stage two
 CosmOS
-> saved it
+> Files
+saved it
 read it back, 22 bytes:
 a file kept by asking
 renamed it
 deleted it
 and it is gone
 finished
-> made
+> mkdir Notes
-> /Notes> 0 files
+made
-/Notes> halted
+> cd Notes
+/Notes> dir
+0 files
+/Notes> exit
+halted
 Execution halted.
 [exit 0]

Tests/input/cosmosEditKeys.in

@@ -0,0 +1,7 @@
+eco ok„ƒƒh
+Xecho ok„†
+echo o„…k
+echo okX
+echo k‚o
+Xecho aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa„†…!
+exit

Tests/lint-baseline.txt

@@ -16,7 +16,7 @@ Programs/CosmOS/Assembler/token.asm	redundant-setd	2
 Programs/CosmOS/Assembler/tokenTest.asm	redundant-setd	1
 Programs/CosmOS/Source/config.asm	redundant-assignment	1
 Programs/CosmOS/Source/cosmos.asm	redundant-assignment	1
-Programs/CosmOS/Source/cosmos.asm	redundant-setd	9
+Programs/CosmOS/Source/cosmos.asm	redundant-setd	10
 Programs/CosmOS/Source/sbfs.asm	branch-to-next	1
 Programs/CosmOS/Source/sbfs.asm	redundant-assignment	4
 Programs/CosmOS/Source/sbfs.asm	redundant-setd	1

Tests/manifest

@@ -305,6 +305,16 @@ cosmosPress          | CosmOS/Source/cosmos.asm           | run      | cosmosPre
 # end - the window's path through the gatherer - and it has its own copy of the line mode
 # rule, so it needs its own test. The two recordings should agree, which is the point.
 cosmosPressKeys      | CosmOS/Source/cosmos.asm           | run      | -                  | -     | disks/cosmos.img | cosmosPress.in
+# The shell editing the line it is being given, which is the whole reason the keys were
+# made to arrive. Every line here is typed wrong and then corrected with a different key, and
+# every one of them comes out as the same command - so the recording says both what the
+# machine printed on the way and that the line the shell finally acted on was right.
+#
+# The escape sequences in it are the point rather than noise: moving the cursor by hand is
+# what a terminal is TOLD about, and they are the only evidence of where the shell thinks it
+# is. The last line is eighty five characters at a prompt in column two, so the cursor has to
+# be found on the row below - the one case the arithmetic exists for.
+cosmosEditKeys       | CosmOS/Source/cosmos.asm           | run      | cosmosEditKeys.in  | -     | disks/cosmos.img
 # The shell taking things off a disk and calling them something else, which is the last of
 # CosmOS's original four verbs to be built and the first time anything has changed a disk
 # from the shell. Its own image, because it changes what is on it: a fixture named with a