168742261957c43930309ca65487273d71f5744a
54
Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
  AnachronautandClaude Opus 5
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b3726c950a |
Deliver the keys that are not characters
An arrow key has never reached this machine. Voyager threw it away for want of anywhere to put it, and a terminal sent ESC [ A, which arrived in the middle of whatever was being read and made it unrecognisable - typing Up at the CosmOS prompt put three bytes in the command line and got "I do not know". So the console names them: one byte each, 0x80 upward, above ASCII so nothing written before them can collide. Up, Down, Left, Right, Home, End and forward Delete, with room above for the paging and function keys. The console normalises, which is what it already does. Behind a window it turns the key somebody pressed into a byte; on a terminal it turns the sequence into the same byte. That is the act it has always performed on Return and Backspace, one layer further along, and it is why a program need not know which of the two it is talking to. What a key MEANS is not the console's business - that belongs to whoever is reading, the same way what is on a disk belongs to the system and what a drive is belongs to the machine. Translated only when standard input really is a terminal. Nothing else sends these sequences, a pipe holds exactly the bytes somebody put in it, and it keeps the Escape-or-Up timing problem out of every test here: a test writes the key values themselves. Line mode drops them, in both front ends, because line mode delivers characters and a line somebody else has finished editing cannot be moved about in. Press.sbx says what it was handed, in hexadecimal and by name, and reads a line before it reads keys so both halves of that rule are checked. Two recordings, one fed as standard input and one as a keyboard, agreeing byte for byte; each break fails exactly one of them. Three checks in terminal.sh type real escape sequences at a pseudo-terminal, which is the only place they are ever read as sequences: that they arrive as keys, that Escape alone is still Escape, and that a character typed straight after an escape is held rather than swallowed. Five recordings re-blessed for Press.sbx appearing on the shared disk, and the whole of that diff is the file's own line and the counts above it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW |
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AnachronautandClaude Opus 5
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2a29cebc6b |
Make the screen come back on the machine people actually run
Found by running it: Grid exits and the shell prints its prompt into the grid, with the view up to seven pixels out of alignment. Three faults, and the first is the one that made the other two visible. MAKE RUN-VOYAGER HAD NO SCRATCH DRIVE. It gives drive 1 to Disks/personal.img, which is a file and not volatile, so there was nowhere to keep a screen - osTakeScreen answered no and the whole feature silently did not happen. It was tested with --ram-disk and shipped without one, which is as good a description of testing the wrong machine as I can write. There is now a RAM disk in drive 2, after the personal disk so that drive 1 stays the one that is yours. A PROGRAM TOLD NO MUST COPE. A refusal is not a fault, it means doing what the program did before there was anywhere to save a screen. Grid deleted its own tidying up when it started asking, so being refused left the grid on screen with a prompt written into it. It clears up again when refused, and only then. AND THE SYSTEM ALWAYS LEAVES THE SCREEN USABLE. The fine scroll registers go back to zero at every program exit, whether or not the picture could be saved: the console draws in whole cells, so a view three pixels into one puts every character three pixels out for ever. That is not part of saving a screen and should never have depended on it. Both paths are checked now. With a scratch drive the screen comes back cell for cell; without one, no grid is left behind. Breaking either fails one of them and not the other. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW |
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AnachronautandClaude Opus 5
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ab72443b99 |
Give the screen back: osTakeScreen, and the RAM disk earns its keep
A program that takes the whole screen leaves the shell a blank one, and
whatever was on it is gone. There was nowhere to put 48K of video memory on
a machine with 64K of Data Memory that CosmOS already lives in.
A DRIVE MADE OF MEMORY IS SOMEWHERE. The screen goes to a file on the
scratch drive - the first volatile drive found at boot - like any other
file, and comes back from handleExit alongside the vectors and console mode
already put back there. The filesystem does the allocating, so this
invented nothing: it is 196 pages of tiles, map and palette, with a block
on the front holding the cursor, the four scroll registers and the mode.
NOT AUTOMATIC, and that is the whole design. Saving on every program start
would be cheap enough; restoring on every exit would be wrong, because dir
and Files and Say print and stop and their output is the reason you ran
them. A program says it took the screen, and one that says nothing behaves
exactly as every program did before this existed.
It deleted thirty lines of Grid, and they were all wrong anyway: four
scroll registers put back by hand, the map filled with spaces, the cursor
sent home, palette bank 0 written out - and the other fifteen banks kept
Grid's colours, because there was nowhere to have kept the real ones. Grid
is 64 bytes smaller and gives back what was actually there.
The check compares the screen before against the screen after, CELL BY
CELL, and allows only the rows around the cursor to differ - found from
where the text ends rather than guessed at, because the first version
assumed the cursor was near the bottom of the screen and let three real
differences through.
Two things cost time and neither was the feature:
- An edit adding "SWI osTakeScreen" to Grid was in the same script as a
failing s.index, so the file was never written - and the COMMENT
describing the call did land, from a later edit. Grid documented a call
it did not make, and read as though it should have worked.
- docs.sh caught osTakeScreen having no row in the services table, which
is the check the service layer added for exactly this and the second
time it has earned itself.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
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AnachronautandClaude Opus 5
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e4f4bae762 |
Work across two disks: copy between them, and run a program from one on
files from the other Two things anybody expects of a second disk, and each needed something different. COPYING NEEDED TWO THINGS TO REMEMBER A DRIVE. The write stream is the only thing here that lives across service calls, so it is the only thing whose drive can change underneath it: every osFileBlock names its source path again and goes back to the source drive, and then osFileWrite has to come home. It records the drive it was opened on and returns there. And the file lookup CACHE. It keeps the last path resolved so a reader walking a file does not re-walk the directory for every block - and skipping the walk skipped the drive the path named, so block one of a cross-drive copy read the source's block numbers off the DESTINATION disk. It only showed on files of more than one block, because a file of one is never looked up twice. One block worked and two did not, which is a suspicious enough shape to have suspected sooner. RUNNING A PROGRAM FROM ELSEWHERE NEEDED A THIRD PLACE TO LOOK, and two restorations. The shell tried where you are and /Apps on the disk you are on. It now tries /Apps on drive 0 as well, which is what makes the system's programs work from a disk of your own - one with your files on it and no system, which is most of the point of having a second disk. The drive goes back after the load, because by then the program is in memory and the blocks it came from mean nothing; and again when it exits, because a program that copies between disks moves the drive as its own paths need to and being left wherever it finished is not what was asked for. Copy 1:/a 0:/b now leaves you exactly where you were. The fixture disk grew an /Apps, because it kept its programs at the root and so could not exercise the third place at all. Two hours of the debugging above were spent on a stale disk image. The machine boots the system that is ON the image, so a rebuilt cosmos.bin means nothing until the image is rebuilt too - and the trace said my new code never ran, which was true. Third time this project has been misled by one. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW |