pydmcsid
Pure-Python reader and player for DMC (Demo Music Creator) SID tunes — the
C64 player by Brian/Graffity ("-PLAYER (C) BRIAN/GRAFFITY!").
A DMC .sid is the player binary plus the per-tune song data resident in the same
image. pydmcsid loads the image, locates the per-tune table bases from the player
code operands (no baked addresses — a differently-sized tune relocates its tables),
and runs a faithful integer transcription of the 6502 play routine, exposing the
per-frame SID register writes.
Usage
import pydmcsid
song = pydmcsid.read("tune.sid")
for w in pydmcsid.iter_register_writes(song, max_frames=50 * 60):
print(w.clock, w.reg, w.val) # absolute CPU cycle, $D4xx reg offset, value
iter_register_writes follows the shared py* register-log convention
(pygoattracker / pymusicassembler): one RegWrite(clock, reg, val) per SID
write, frames cycles_per_frame apart. The DMC player emits one tight write burst
per VBI play call.
What it models
Tempo divider, per-voice orderlist walk (transpose / loop / stop), pattern walk
(note / instrument-select / duration / effect / gate), stride-11 instrument records
driving PW init + a 16-bit PW sweep, the $FF-arp wavetable, triangle vibrato,
glide, the pitch-slide effect and a 6-step filter sweep, the hard-restart window,
and the final per-voice frequency compose. Transcribed from the DMC disassembly.
License
Apache-2.0.
1 maintainer
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