antirez/c64-hw-simulator
Commodore 64 hardware simulator
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From the publisher
README & documentation
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c64-hw-sim simulates the motherboards of the Commodore 64 (ASSY 250407) and of the ZX Spectrum 48K (board Issue 3B), pin by pin. You can lift the leg of a chip, short it to ground or to +5V, pull a chip out of its socket, or open a resistor. Then you watch what the machine does: the picture on the monitor, the keyboard, every signal on the board. The program knows the board's netlist (the electrical connections on the PCB) and how each chip behaves at its pins. It knows nothing about what a broken Commodore 64 or Spectrum looks like: when you simulate a broken part and the screen fills with garbage, that garbage was computed from the circuit, not chosen by someone who knew what to expect. Here is an example. Lift pin 17 (A7) of the C64 color RAM before power on, and the machine boots and looks…
Read the full README ↗ · Preview checked 2026-10-28T14:40:58.123Z
Inside the original README — Document outline
- c64-hw-sim
- Acknowledgements
- Building
- Using it
- Commodore 64
- ZX Spectrum 48K
- The ULA
- The Z80
- Command line
- How it works
- Limits
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What this repository does
Commodore 64 hardware simulator
Repository facts
- Owner
- antirez
- Primary language
- C
- Stars
- 406
- Forks
- 16
- Open issues + pull requests
- 2
- License
- Other
- Archived
- No
- Default branch
- main
- Created
- 2026-10-15T07:14:32.000Z
- Last push
- 2026-10-20T08:20:36.000Z
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Source and freshness
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