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by to3m
3025 days ago
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I copied the 6510 illegal opcode behaviour for the SY6502A emulator for my BBC Micro, and I've yet to see a problem from it. If they didn't all have the same PLA, then perhaps the differences didn't cause any useful effects... (Some BBC Micro games definitely do use illegal opcodes, but I didn't take very careful notes when I was writing ver 1, rather a long time ago. For the current version, I just made sure the Lorenz 6502 test suite ran to completion.) |
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