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UMC Green 64 D6 - causes EAX to be set to 0xAB6B1B07
related to 80487:
FIDIVRP Floating Point Integer Divide, Reversed, Pop (Cyrix Cx486DX/ZFx86, also mentions FLY2X, FLY2XP1 that look like mnemonic typos for FYL2X, FYL2XP1?)
custom Manufacturer ID via MSRs - also possible on WinChip/C3/C7/Nano, Transmeta, Vortex86EX2 (DOSbox-X can do that via .conf) and custom Processor Brand String (some Athlon/Geode)
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Tickbox list of instructions, supported by CPUs which don't have 64-bit mode (based on this and that).
Jumps to alternative instruction sets:
You can tick /untick the boxes above for instructions that are already emulated. I filled in those that I found.
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