AnachronautandClaude Opus 5
d6c81fa32c
A lander over a moon that wraps. Landing, crashing, fuel, cargo and bases are not here - this rung exists to answer whether it FEELS right, because everything after it is bookkeeping and none of it is worth building on a lander that is no fun to fly. The moon comes for free. The map's column origin is a ring in hardware, so 128 cells is 1024 pixels of surface with no edge and no seam to cross. Position and velocity are sixteen bit in SIXTEENTHS OF A PIXEL, and the unit is the design: gravity is a small number added to a velocity and a velocity is a number added to a position, with no multiply or divide anywhere. 1024 pixels is 16,384 sixteenths, which is 2^14 - so going all the way round is an AND with 0x3FFF rather than a comparison, and it is never wrong at the seam. The lander never moves sideways. The world scrolls under it and it sits at the middle of the screen, which is a byte a frame instead of two and is also what makes the wrap invisible: there is no moment where it jumps. One key is one burn. The console says which key went down and there is no such thing as a key coming up, so a thruster cannot be held - a press adds to the velocity once. That is a property of the machine rather than a choice this program made, and it reads as pumping the engine. Four bugs found by running it, all worth keeping written down: B CANNOT BE A LOOP COUNTER here. Every comparison is an INIB, so the count was overwritten by whichever bound was last tested and the loop reset itself for ever. Counters that outlive arithmetic live in memory. A subroutine answers in Q, and the AND after it read A. The moon came out flat because it was testing the height against 1 instead of the random number. Row minus height, not height minus row: they are equal at the surface, equal does not borrow, and the surface row has to be ground. And the shift register has A as its HIGH half. Written the other way, the view scrolled by 256 cells for every one it should have. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
132 lines
3.2 KiB
Plaintext
132 lines
3.2 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 984
|
|
Crash.sbx 632
|
|
vars.script 50
|
|
blocks.script 343
|
|
loops.script 272
|
|
tune.sbx 306
|
|
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
|
|
28 files, 1 directory
|
|
> exit
|
|
halted
|
|
Execution halted.
|
|
[exit 0]
|