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by RetroSpark
403 days ago
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I don't know if they even had an emulator at the time - I don't think a 1980s PC could run a NES emulator at a reasonable speed. Another possibility is that they used a hardware device. Perhaps something that watches the 6502 `sync` pin to know when an opcode byte is being read, and verifies that the data bus contains a legal value. |
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