Give the system another page of each memory

CosmOS had 1,161 bytes of Program Memory left before the address applications
load at, and Tab completion is not going to fit in that with anything to spare.
So the wall moves up one page: the system keeps below 0x4FFF and 0x2FFF, and an
application is based at 0x5000 and 0x3000.

A PAGE IS A CHEAP THING TO GIVE IT AND AN EXPENSIVE THING TO RUN OUT OF. An
application still has 44K of Program Memory before the vector table and the
largest one here uses 7.5K, so what was taken from applications is space nothing
has ever asked for - while what the system gained is the difference between
building the next thing and counting bytes while building it.

Not doubling, which was the version that would have cost application space worth
minding. One page, and the same again when it is needed.

Nothing in the machine knows where the wall is, so this is 34 #Base lines, one
threshold in the fault handler, and the table in the CosmOS README that
Tests/docs.sh reads its limits out of.

The native assembler's scratch map had to move with it, and docs.sh said so
before anything ran: its data reached 0x40D6 and its buffers began at 0x4000, so
they were sitting on its variables. That file already carries a paragraph about
the floor coming up and the map staying where it was. It has happened twice now,
and been caught by a check the first time wrote.

Twenty three recordings are the same runs a page higher.

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

Tests/expected/cosmosBreak.out

@@ -1,15 +1,15 @@
 CosmOS
 > load Break.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 two stops, and what the registers were at each
-break at 4016
+break at 5016
 A 11 B 22 Q 00 status 00 
-DP0 2030 DP1 2000 DP2 2037 DP3 4000 SP FFFF
+DP0 3030 DP1 3000 DP2 3037 DP3 5000 SP FFFF
 press a key 
-break at 4034
+break at 5034
 A 44 B 55 Q 00 status 00 
-DP0 2000 DP1 2037 DP2 2030 DP3 4000 SP FFF5
+DP0 3000 DP1 3037 DP2 3030 DP3 5000 SP FFF5
 press a key 
 carried on to the end
 finished

Tests/expected/cosmosEdit.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Edit.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run poem.txt
 poem.txt, new file
 > a

Tests/expected/cosmosEditService.out

@@ -2,7 +2,7 @@ CosmOS
 > echo remembered by the shell
 remembered by the shell
 > load Edit.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run typed.txt
 typed.txt, new file
 > a

Tests/expected/cosmosFault.out

@@ -1,18 +1,18 @@
 CosmOS
 > Crash opcode
-that byte is not an instruction, at 4081
+that byte is not an instruction, at 5081
   A 00  B 0F  Q 00
 the program was stopped
 > Crash service
-nothing is installed at service 28, at 4084
+nothing is installed at service 28, at 5084
   A 00  B 0F  Q 00
 the program was stopped
 > Crash bank
-a bank that is not there, or an address past its end, at 409E
+a bank that is not there, or an address past its end, at 509E
   A 01  B 0F  Q 00
 the program was stopped
 > Crash device
-nothing is installed for the device on port 00, at 40A5
+nothing is installed for the device on port 00, at 50A5
   A 02  B 0F  Q 00
 the program was stopped
 > Crash sideways

Tests/expected/cosmosHello.out

@@ -1,6 +1,6 @@
 CosmOS
 > load hello.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 Hello, World!
 finished

Tests/expected/cosmosKeys.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Keys.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 keys, by interrupt. q stops.
 ab

Tests/expected/cosmosLife.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Life.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
   #             
    #            

Tests/expected/cosmosLifeKey.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Life.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
   #             
    #            

Tests/expected/cosmosMonitor.out

@@ -6,30 +6,30 @@ b <program|data|number>
 * b 9
 there is no such bank
 * load greet.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 * 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
-400C  47 00 20 7A  SETD.0 207A
-4010  27 1F        INIB 1F
-4012  72 11        SWI 11
-4014  47 00 20 5D  SETD.0 205D
+4000  00       ?
+4001  00       ?
+4002  00       ?
+4003  00       ?
+4004  00       ?
+4005  00       ?
+4006  00       ?
+4007  00       ?
 * 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........
+4000  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
+4010  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
+4020  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 4030  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 * b data
 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 
+2000  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
+2010  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
+2020  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
+2030  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 * b 2
 bank 02
 * x 0

Tests/expected/cosmosMonitorRun.out

@@ -5,7 +5,7 @@ x examine, d disassemble, a assemble, s set, b bank, g go, exit leaves
 it says: hello from the monitor
 finished
 * Crash opcode
-that byte is not an instruction, at 4081
+that byte is not an instruction, at 5081
   A 00  B 0F  Q 00
 the program was stopped
 * nonsense

Tests/expected/cosmosMore.out

@@ -1,6 +1,6 @@
 CosmOS
 > load More.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run readable.txt
 first line
 second line

Tests/expected/cosmosRun.out

@@ -31,7 +31,7 @@ no such file
 > load notes.txt
 not a program
 > load greet.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 a program, loaded off a disk, running on the system that loaded it
 what should I call you? Anachronaut

Tests/expected/cosmosSay.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Say.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 nothing was said
 finished

Tests/expected/cosmosServices.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Files.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 saved it
 read it back, 22 bytes:

Tests/expected/cosmosSlowDisk.out

@@ -23,7 +23,7 @@ inner.script            44
 loop.script             35
 20 files, 1 directory
 > load Say.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run the disk took its time
 it says: the disk took its time
 finished

Tests/expected/cosmosSnake.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Snake.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 +----------------+
 |                |

Tests/expected/cosmosSource.out

@@ -1,6 +1,6 @@
 CosmOS
 > load readTest.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > 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.

Tests/expected/cosmosStream.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Stream.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run
 big.txt is 329 blocks
 read 329 blocks, checksum 57368, stopped with 3

Tests/expected/cosmosTokens.out

@@ -1,6 +1,6 @@
 CosmOS
 > load tokenTest.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run hello.asm
 4  keyword 0 [#Program]
 6  label:  0 [Start:]

Tests/expected/cosmosTree.out

@@ -4,22 +4,22 @@ Apps                    <dir>
 rooted.txt              21
 1 file, 1 directory
 > load /Apps/Say.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run the shallow one
 it says: the shallow one
 finished
 > load /Apps/Deep/Say.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run the deep one
 Hello, World!
 finished
 > load /Apps/./Deep/../Say.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run the shallow one again
 it says: the shallow one again
 finished
 > load /Apps/Deep/../../Apps/./Deep/Say.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run the deep one the long way round
 Hello, World!
 finished

Tests/expected/cosmosTreeWrite.out

@@ -4,7 +4,7 @@ Folder                  <dir>
 Edit.sbx                2243
 1 file, 1 directory
 > load Edit.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run note.txt
 note.txt, new file
 > a

Tests/expected/cosmosType.out

@@ -1,6 +1,6 @@
 CosmOS
 > load Type.sbx
-loaded, starting at 4000
+loaded, starting at 5000
 > run readable.txt
 first line
 second line