mirror of https://github.com/bsnes-emu/bsnes.git
d0ddd87e9c
byuu says: Man, the 80186 is taking a lot longer to implement than I thought it would. So far I'm 18 hours into this emulator. Whereas I had Super Mario Bros fully playable (no sound) in 12 hours for the NES >_> I refactored all the byte/word variant functions to single functions that take a size parameter. Cuts the amount of code in half. Also implemented repz/repnz + movsb/movsw, so Riviera now gets 299 instructions in before dying. Nobody really bothers to explain how the CPU actually implements these instructions, but I think I have it right: ignore non-string opcodes that follow rep, invoke the string operations inside the rep opcodes to prevent interrupts from triggering between the two (which will be even more fun for segment selector overrides ...) The next opcode needed is 0xC7, which ... throws ModRM on its head. In this mode, ModRM is only used to determine the target operand (and it doesn't use the middle bits for that at all), and the source is an immediate that follows it. Gonna have to waste a few more hours thinking about how best to handle that. Also, disabled HiDPI for higan as well on OS X. |
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| .. | ||
| algorithms.cpp | ||
| disassembler.cpp | ||
| instructions.cpp | ||
| memory.cpp | ||
| registers.cpp | ||
| v30mz.cpp | ||
| v30mz.hpp | ||