diff options
-rw-r--r-- | src/mame/drivers/cntsteer.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/src/mame/drivers/cntsteer.c b/src/mame/drivers/cntsteer.c index 229ec937897..3766eb129a2 100644 --- a/src/mame/drivers/cntsteer.c +++ b/src/mame/drivers/cntsteer.c @@ -16,11 +16,13 @@ - according to a side-by-side test, sound should be "darker" by some octaves, likely that a sound filter is needed; cntsteer specific: - - proper bus request support, starting from understanding the role of DP register in M6809 core - (having that returning non-zero in NMI for subcpu forces a reset?); - - Understand how irq communication works between CPUs. Buffer $415-6 seems involved in the protocol. - - understand who's master and who's slave between "back" and "mix" CPUs (order might be actually inverted); - - understand why background mirroring causes wrong gfxs on title screen (wrong tilemap paging); + - In Back Rotate Test, rotation is tested with the following arrangement (upper bits of rotation parameter): + 04 -> 05 -> 02 -> 03 -> 00 -> 01 -> 06 -> 07 -> 04 and backwards + Anything with bit 0 set is tested from 0xff to 0, with bit 0 clear that's 0 -> 0xff, fun. + - Understand how irq communication works between CPUs. Buffer $415-6 seems involved in the protocol. + We currently have slave CPU irq hooked up to vblank, might or might not be correct. + - invert order between maincpu and subcpu, subcpu is clearly the master CPU here. + - understand why background mirroring causes wrong gfxs on title screen (wrong tilemap paging, missing video bit or it's actually a RMW thing); cleanup - split into driver/video; |