68000:

Timings:

 - MULU/MULS/DIVU/DIVS have funky timings.
 - How many cycles does TRAP take to execute?
 - How many cycles does it take to accept an interrupt?
 - AND has some funky timings when it comes to immediates?

GAMES:

Monster World 4 - Music is messed up now. Timing is all off. It used to work.
Quackshot doesn't boot.
Moonwalker doesn't boot.
Altered Beast: start with 0 health, 0 lives???
Contra Hard Corps: Scrolling is messed up in level 1... used to work. Window seemed to mess things up.
After Burner 2: No music
MUSHA: Intro music starts too soon
MUSHA: uses unimplemented VRAM copy
MUSHA: Some sprites have messed up left/right symmetry
Landstalker: freezes during new game sequence, very early
Arcus Odyssey does UNHANDLED Z80 READs... is this a problem?
ahhh! real monsters - no sound
Alien Storm.... Controls all messed up. Same with Aero the Acrobat.
Devilish/Bad Omen - uses VRAM copy (unimpl)
Blood Shot - FPS game - some texture corruption

Things that read from VRAM work like 50%-90%, but not 100%. It's frustrating. Kid Chameleon and Eternal Champions are examples.

Some games flicker in the rightmost columns. Is this caused by mid-frame mode shifting(32/40 col modes?) Alisia Dragoon is one example.


TODO: non-instant DMA emulation
TODO: Add 68000/VDP interrupt enable delay (one instruction, similar to After Burner/PCE)
TODO: freaking H-interrupts
TODO: Test DMA/ VDP command words.... I'm not at all convinced that VRAM is always correct








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Notable games:
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Ghouls n Ghosts sets up the graphics planes backwards from normal, by setting the plane A to be low priority and Plane B to be high priority.
If you have a bug in your priority code this may find it.

Revenge of Shinobi will not play DAC sounds if YM2612 registers are not initialized to L/R channels enabled.

Ballz doesnt really initialize hardly any VDP registers, relies on VDP registers powered-on to the correct values

Contra appears to use VDP A0 set = byte-swap. Not sure if its important in anyway in that game, but the byte swap happens.