AnachronautandClaude Opus 5
1b251fb290
tune.asm counted the screen's frames, because until 6b51d63 the frame
was the only regular beat on the machine. It is now driven by the timer.
THE DURATIONS ARE NOT A CONVERSION OF THE OLD ONES. A frame is 16,667
cycles, so a sixteenth note at 120 beats a minute is seven and a half of
them and could not be asked for at all: the arpeggio was written as
seven whole frames, which is six and a half per cent fast, and the rest
of the piece was written to a tempo picked so its subdivisions landed on
whole frames. The tick is now 125,000 cycles, which IS that sixteenth
note, and the durations are what the music wanted in the first place -
an eighth is two ticks, a quarter four, the arpeggio one each.
The player's loop did not change shape: a note table, a wait on each
beat, the gate dropped at the end. Only what it waits on. The handler
stays a bare RETI, because taking the interrupt is what brings the line
down - a program that POLLED the timer would have to read 0x50, and the
comment now says so, since that is the trap.
Three checks in sound.sh, on a program that is the player's loop rather
than the tune: eight ticks last eight periods to within a tenth of a per
cent, and the seventh and eighth notes are measured where the ticks put
them. The middle one is the one that fails on the old timing - at seven
whole frames the boundary slides under the window and it reads 384 Hz,
which is neither note and is what a crossing counter says when given
two. Verified with break.sh by moving the timer's period a byte.
tune.sbx grew 306 -> 318 bytes, which is why ten cosmos recordings moved:
they quote a directory listing. Nothing else in them changed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
57 lines
1.4 KiB
Plaintext
57 lines
1.4 KiB
Plaintext
CosmOS
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> Crash opcode
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that byte is not an instruction, at 5081
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A 00 B 0F Q 00
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the program was stopped
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> Crash service
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nothing is installed at service 28, at 5084
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A 00 B 0F Q 00
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the program was stopped
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> Crash bank
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a bank that is not there, or an address past its end, at 509E
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A 01 B 0F Q 00
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the program was stopped
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> Crash device
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nothing is installed for the device on port 00, at 50A5
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A 02 B 0F Q 00
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the program was stopped
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> Crash sideways
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Crash opcode | service | bank | device | blind
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finished
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> dir
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greet.sbx 211
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hello.sbx 53
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Life.sbx 1396
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Snake.sbx 2164
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Keys.sbx 664
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Say.sbx 156
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Break.sbx 149
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Grid.sbx 571
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Press.sbx 872
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Mode.sbx 48
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Flip.sbx 173
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Sprite.sbx 442
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Depth.sbx 672
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Lander.sbx 9201
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Pad.sbx 264
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Crash.sbx 632
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vars.script 50
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blocks.script 343
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loops.script 272
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tune.sbx 318
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notes.txt 21
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Apps <dir>
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hi.script 121
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bad.script 45
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plain.script 24
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cross.script 280
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nonl.script 38
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outer.script 376
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inner.script 44
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loop.script 35
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29 files, 1 directory
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> exit
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halted
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Execution halted.
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[exit 0]
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