The Dumping Project found and I paid for 3 of the remaining undumped ZN-1 boards: 1 on 1 Government, The Block Kuzushi, and Bust A Move (the cult hit Metro dancing game, known as Bust a Groove outside of Japan). Guru should have ’em in a few weeks.

Also more ARM7 fixes (including several that were backported to the original ARM core – could someone check if it’s now possible in u2 to beat the end boss on Dragon Gun?), so of course I have a few new GBA screens.

More work on the ARM – SUB/SBC/CMP in Thumb mode were miscalculating the carry flag, and I also improved a few more GBA hardware bits. More games are showing their faces and/or playing better music and/or showing better graphics.

MooglyGuy and I shook the ARM7 core and some more bugs fell out, with these results. Keep in mind the GBA video emulation in the driver is extremely simplistic right now, so it’s amazing this stuff shows as well as it does 🙂 You can’t tell here, but all the sound hardware is present and rockin’ in most of these games too.

MAME/MESS’s ARM7 core was misinterpreting the very important Thumb version of SWI (SoftWare Interrupt, used on GBA to call the very useful BIOS routines) as “branch always”. Fixed that, and all sorts of things lit up.