AnachronautandClaude Opus 5
bfc46d982e
The loader, and the reason it is small: everything in a tune is an offset from wherever it was put, so taking one means adding the base to two tables and pointing four voices at their order lists. No sequence is walked. Nothing inside one is an address to be found and corrected, which is the difference between a malformed tune that plays wrongly and one that takes the loader with it. "SBTU", version, the tick in cycles, how many patches and sequences, offsets to the two tables, an order list each, and the patch each voice starts on. The magic is checked before anything else, because from there on the loader follows what the offsets name. break.sh shows what that guard is worth: without it, handing Play a PROGRAM runs the machine away until the cycle limit, rather than saying it is not a tune. PatchTable, SequenceTable and VoiceStart became pointers, so the engine does not care whether a tune came out of a file or was assembled in. Play's built-in tune now hands over the same three addresses a loaded one would, in eight lines - which is what keeps the two paths from drifting, and what made this rung change no scheduler code at all. Tests/maketune.py lays the fixture out byte by byte. IT IS NOT THE COMPILER: the sequences and the patches are literal bytes and the only thing computed is where each piece lands. That is the point - the loader is checked by something that does not share its idea of the format, which is the same reason SplitDisk and sbfs.asm share nothing but a specification. Both notes in the fixture are number 60, so the octave between them is a 0x80 command loading the second patch out of the file: the header, the tick, the relocation, an order list and a patch from a file, measured in one go. Play and the tune live on quiet.img rather than cosmos.img, so a fixture does not move ten recordings every time it changes size. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
134 lines
3.3 KiB
Plaintext
134 lines
3.3 KiB
Plaintext
CosmOS
|
|
> monitor
|
|
x examine, d disassemble, a assemble, s set, b bank, g go, exit leaves
|
|
* b nonsense
|
|
b <program|data|number>
|
|
* b 9
|
|
there is no such bank
|
|
* load greet.sbx
|
|
loaded, starting at 5000
|
|
* b program
|
|
bank 00
|
|
* d 5000
|
|
5000 47 00 30 00 SETD.0 3000
|
|
5004 72 10 SWI 10
|
|
5006 47 00 30 44 SETD.0 3044
|
|
500A 72 10 SWI 10
|
|
500C 47 00 30 7A SETD.0 307A
|
|
5010 27 1F INIB 1F
|
|
5012 72 11 SWI 11
|
|
5014 47 00 30 5D SETD.0 305D
|
|
* x 5000
|
|
5000 47 00 30 00 72 10 47 00 30 44 72 10 47 00 30 7A G.0.r.G.0Dr.G.0z
|
|
5010 27 1F 72 11 47 00 30 5D 72 10 47 00 30 7A 72 10 '.r.G.0]r.G.0zr.
|
|
5020 47 00 30 65 72 10 20 72 12 00 00 00 00 00 00 00 G.0er. r........
|
|
5030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
|
|
* b data
|
|
bank 01
|
|
* x 3000
|
|
3000 61 20 70 72 6F 67 72 61 6D 2C 20 6C 6F 61 64 65 a program, loade
|
|
3010 64 20 6F 66 66 20 61 20 64 69 73 6B 2C 20 72 75 d off a disk, ru
|
|
3020 6E 6E 69 6E 67 20 6F 6E 20 74 68 65 20 73 79 73 nning on the sys
|
|
3030 74 65 6D 20 74 68 61 74 20 6C 6F 61 64 65 64 20 tem that loaded
|
|
* b 2
|
|
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 ................
|
|
* s 0 FF
|
|
that bank will not be written
|
|
* 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
|
|
8008 18 SHR
|
|
8009 12 AND
|
|
800A 00 ?
|
|
800B 00 ?
|
|
* g 8000
|
|
H
|
|
that byte is not an instruction, at 800A
|
|
A 85 B 3F Q 05
|
|
the program was stopped
|
|
* d 8000
|
|
8000 26 48 INIA 48
|
|
8002 D1 00 OUTA 00
|
|
8004 26 0A INIA 0A
|
|
8006 D1 00 OUTA 00
|
|
8008 18 SHR
|
|
8009 12 AND
|
|
800A 00 ?
|
|
800B 00 ?
|
|
* b data
|
|
bank 01
|
|
* s 8100 68 65 6C 6C 6F 2C 20 74 79 70 65 64 0A 00
|
|
* b program
|
|
bank 00
|
|
* a 8200
|
|
8200: SETD.0 8100
|
|
8204: SWI 10
|
|
8206: lda.2
|
|
8208: LDD.0.1
|
|
820B: frobnicate
|
|
no such instruction
|
|
820B: INIA
|
|
that one needs a value after it
|
|
820B: SWI 12
|
|
820D: .
|
|
* d 8200
|
|
8200 47 00 81 00 SETD.0 8100
|
|
8204 72 10 SWI 10
|
|
8206 42 02 LDA.2
|
|
8208 4A 00 01 LDD.0.1
|
|
820B 72 12 SWI 12
|
|
820D 00 ?
|
|
820E 00 ?
|
|
820F 00 ?
|
|
* g 8200
|
|
hello, typed
|
|
finished
|
|
* exit
|
|
> dir
|
|
greet.sbx 211
|
|
hello.sbx 53
|
|
Life.sbx 1396
|
|
Snake.sbx 2164
|
|
Keys.sbx 664
|
|
Say.sbx 156
|
|
Break.sbx 149
|
|
Grid.sbx 571
|
|
Press.sbx 872
|
|
Mode.sbx 48
|
|
Flip.sbx 173
|
|
Sprite.sbx 442
|
|
Depth.sbx 672
|
|
Lander.sbx 9201
|
|
Pad.sbx 264
|
|
Crash.sbx 632
|
|
vars.script 50
|
|
blocks.script 343
|
|
loops.script 272
|
|
tune.sbx 318
|
|
Play.sbx 2525
|
|
notes.txt 21
|
|
Apps <dir>
|
|
hi.script 121
|
|
bad.script 45
|
|
plain.script 24
|
|
cross.script 280
|
|
nonl.script 38
|
|
outer.script 376
|
|
inner.script 44
|
|
loop.script 35
|
|
30 files, 1 directory
|
|
> exit
|
|
halted
|
|
Execution halted.
|
|
[exit 0]
|