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c64-sid-audit

Validate Commodore 64 SID 6581/8580 sound emulation in EMULATORS, including $D400-$D7FF register decoding, voices, frequency, pulse width, control bits, ADSR/envelope behavior, oscillator sync/ring/noise/test, filters, volume DAC/sample clicks, paddles, read-only registers, mirrors, and reSID integration. Use when Codex reviews or edits SID, Sound, audio wrapper, register, filter, waveform, envelope, or mapped SID behavior.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

Commnets/EMULATORS
설치 방법 보기

포함된 파일(3)

  • SKILL.md2.5 KB
  • agents/openai.yaml213 B
  • references/sid.md4.8 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

C64 SID Audit

Core Workflow

Use this skill to audit SID behavior while respecting that a large part of the chip is mixed-signal and model-dependent.

  1. Read references/sid.md before making claims or edits.
  2. Inspect the local implementation paths first:
    • include/COMMODORE/SID/SID.hpp, src/COMMODORE/SID/SID.cpp
    • include/COMMODORE/SID/SIDRegisters.hpp, src/COMMODORE/SID/SIDRegisters.cpp
    • include/COMMODORE/SID/SIDLibWrapper.hpp, src/COMMODORE/SID/SIDLibWrapper.cpp
    • include/C64/Sound.hpp, src/C64/Sound.cpp
    • thirdparties/resid/*
  3. When changing C++ code, also use $emulators-framework-cpp-style.
  4. Distinguish digital register semantics from analog sound character. Register behavior can be tested exactly; filter tone, distortion, and DAC nonlinearity are fidelity targets.
  5. Prefer delegating low-level waveform/envelope/filter generation to reSID unless the existing architecture intentionally wraps or constrains it.

Audit Priorities

Prioritize correctness in this order:

  • Address decoding and mirrors across $D400-$D7FF.
  • Voice register layout for all three voices and correct write-only/read-only behavior.
  • Control register side effects: gate, sync, ring modulation, test, and waveform selection.
  • ADSR state transitions, envelope readback, and known envelope corner cases.
  • 24-bit oscillator phase, noise LFSR behavior, pulse width, combined waveforms, and voice 3 oscillator readback.
  • Filter cutoff/resonance/routing, $D418 mode/volume, 6581 versus 8580 differences, and sample-click/digifix behavior.
  • Paddle reads through $D419/$D41A and interaction with CIA/control port selection.

Validation Hints

For register-level bugs, create small write/read tests. For audible fidelity, compare generated samples against reSID behavior or a known-good C64 emulator with the same SID model and sample rate.

Useful local anchors:

  • thirdparties/resid/sid.cc
  • thirdparties/resid/voice.cc
  • thirdparties/resid/wave.cc
  • thirdparties/resid/envelope.cc
  • thirdparties/resid/filter.cc

리뷰

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같은 저장소의 스킬

c64-1541-audit

무료

Validate Commodore 1540/1541/1541C/1541-II compatible disk-drive behavior in EMULATORS, including IEC serial bus protocol, device numbers, KERNAL traps, CBM DOS commands/status, D64 image parsing, BAM/directory/file chains, PETSCII filenames, 6502 drive CPU/ROM/RAM expectations, 6522 VIA wiring, GCR/track/sector geometry, motor/head timing, and compatibility boundaries for 1541-like devices. Use when Codex reviews or edits C64, VIC-20, C264, COMMODORE disk, serial I/O, D64, CBM DOS, IEC, VIA, GCR, or 1541 drive code.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

Commnets/EMULATORS102026년 10월 18일 업데이트

c64-cia-audit

무료

Validate Commodore 64 CIA 6526 emulation in EMULATORS, including CIA1/CIA2 $DC00/$DD00 register behavior, ports, DDRs, keyboard/joystick matrix, IEC/user port, VIC bank selection, timers A/B, underflow timing, PB toggle/pulse output, TOD clock/alarm, serial shift register, FLAG, ICR masks and IRQ/NMI lines. Use when Codex reviews or edits C64 CIA, timers, ports, keyboard, joystick, serial bus, interrupts, TOD, or VIC bank control.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

Commnets/EMULATORS102026년 10월 18일 업데이트

c64-memory-map-audit

무료

Validate Commodore 64 memory map, PLA/bank switching, 6510 port $0000/$0001 behavior, VIC bank selection, color RAM, ROM/RAM overlays, cartridge mapping, and mirrored I/O in the EMULATORS C64 namespace. Use when Codex reviews or edits C64 memory, PLA, CPU-visible address decoding, VIC-visible memory, color memory, char ROM, cartridge, expansion I/O, or mapped chip register behavior.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

Commnets/EMULATORS102026년 10월 18일 업데이트

c64-mps801-printer-audit

무료

Validate Commodore MPS-801 serial dot matrix printer behavior in EMULATORS, including SerialPrinterMPS801 classes and their MatrixPrinterEmulation and SerialPrinterPeripheralSimulation hierarchy, IEC/KERNAL-trap printer routing, device numbers, secondary addresses, PETSCII/character sets, 6x7 glyphs, double width, graphics mode, reverse field, tab and dot positioning, line/page geometry, PostScript output, and fidelity boundaries. Use when Codex reviews or edits COMMODORE MPS801 printer code, generated printer output, PostScript printer templates, C64/VIC-20/C264 serial-printer behavior, or compares implementation against .codex/docs/MPS801.pdf and historical MPS-801 sources.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

Commnets/EMULATORS102026년 10월 18일 업데이트

c64-mps802-printer-audit

무료

Validate Commodore MPS-802 and 1526 serial dot matrix printer behavior in EMULATORS, including SerialPrinterMPS802 classes and their MatrixPrinterEmulation and SerialPrinterPeripheralSimulation hierarchy, IEC/KERNAL-trap printer routing, device numbers, secondary-address functions, PETSCII/character sets, 8x8 glyphs, enhanced width, reverse and paging modes, formatter strings, programmable characters, line/page geometry, PostScript output, and fidelity boundaries. Use when Codex reviews or edits COMMODORE MPS802 printer code, generated printer output, PostScript printer templates, C64/VIC-20/C264 serial-printer behavior, or compares implementation against .codex/docs/MPS802.pdf, the MPS-802 user guide, and 1526/MPS-802/4023 service information.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

Commnets/EMULATORS102026년 10월 18일 업데이트

c64-vicii-audit

무료

Validate Commodore 64 VIC-II emulation in EMULATORS, including $D000-$D3FF register behavior, PAL/NTSC timing, raster counters, badlines, BA/AEC bus stealing, video matrix and bitmap fetches, sprites, collisions, borders, IRQs, color RAM usage, and display modes. Use when Codex reviews or edits VICII, Screen, Memory/PLA, raster, sprite, video, or cycle-level behavior for C64 classes.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

Commnets/EMULATORS102026년 10월 18일 업데이트

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