byuu says:
I now have enough of three instructions implemented to get through the
first four instructions in Sonic the Hedgehog.
But they're far from complete. The very first instruction uses EA
addressing, which is similar to x86's ModRM in terms of how disgustingly
complex it is. And it also accesses Z80 control registers, which obviously
isn't going to do anything yet.
The slow speed was me being stupid again. It's not 7.6MHz per frame,
it's 7.67MHz per second. So yeah, speed is so far acceptable again. But
we'll see how things go as I keep emulating more. The 68K decode is not
pretty at all.
byuu says:
Changelog:
- moved Thread, Scheduler, Cheat functionality into emulator/ for
all cores
- start of actual Mega Drive emulation (two 68K instructions)
I'm going to be rather terse on MD emulation, as it's too early for any
meaningful dialogue here.
Tim Allen