Fixed address readback in rf5c68 and added a preliminary audio redbook support in Mega CD / Sega CD driver … results are shown in this YT video:

More improvements to Sharp MZ-2500 in the last few days, almost every available game/software works just fine now hence I’ve promoted system to working:

In the other news, me and Dirk Best recently fixed a z80dma <-> wd17xx fdc communication issue that was causing several Sharp X1 Turbo games to not work.

Working on Sharp MZ-2500 (Super MZ), a Japanese computer system of the mid-80. It appears to be a sort of follow-up of the Sharp X1 system, with the same basic characteristic plus (attempts to) remove bottlenecks of that system (color limitations, PCG uploading etc.). I’ve seriously started to work on this system in these few days:

I’ve lately started to emulate the NEC PC-6001 Mk2, that is a modified version of the regular PC-6001. Unlike the latter, this one adds some decent video capabilities, a 40 x 25 character tilemap and a 4bpp bitmap mode, banked in two parts. It’s still nowhere near the capabilities of other PCs of that time (namely Sharp X1), but at least here games looks like … games and not a bunch of random Hunter S. Thompson-esque colors :P.

Started to work at the Sony SMC-70 / SMC-777, that is a pretty powerful (for the time) 1983 japanese computer. Basic spechs includes 16 colors with RAMDAC, PCG graphics, a bitmap layer and 3.5″ floppy drives (it’s the real first system that uses them). After some basic hooking, I’ve managed to get basic CP/M OS to work on it: