Topic: What I've been working on (iq_132's work in progress)

[Haze]

The Sand Scorpion banking code in MAME looks like nonsense, I guess the music will be broken on later levels but nobody has noticed.

For the rest, make sure your latch behavior is correct, make sure you give the CPU time to reply (it needs 2 way communications) make sure the YM is generated the interrupt on the Z80, make sure the comms generate the NMI, and you should be good.

For music the YM interrupt driving the Z80 might be the key, for dipswitch reading the 2 way comms is important, reminds me a bit of Seibu.

[iq_132]

The Sand Scorpion banking code in MAME looks like nonsense, I guess the music will be broken on later levels but nobody has noticed.

For the rest, make sure your latch behavior is correct, make sure you give the CPU time to reply (it needs 2 way communications) make sure the YM is generated the interrupt on the Z80, make sure the comms generate the NMI, and you should be good.

For music the YM interrupt driving the Z80 might be the key, for dipswitch reading the 2 way comms is important, reminds me a bit of Seibu.

Latch behavior is same as MAME's, nmi is triggered, the soundlatch is read, but soundlatch2 is never written. The sound irqs are triggered and cleared, but I'm not sure if they're fast enough? Everything else has been written and re-written.
I even tried to overclock the z80 a bit like you have to with Nostradamus (another Face shmup) in older MAME versions. No luck.

[dink]

MAME:
      m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
      space.device().execute().spin_until_time(attotime::from_usec(100)); // Allow the other cpu to reply
FBA:
         ZetNmi(); <- does that pulse the line, or just send a nmi?  I need an explanation of what pulse_line means.
         ZetRun(100); // ?

Perhaps we need to better emulate the spin_until_time() functionality of MAME, instead of a ZetRun(100); after sending the nmi to the z80?  IIRC & please correct me if I'm wrong: spinning does everything _except_ process instructions.

[Haze]

yeah, PULSE_LINE just triggers the line for an instance, with an NMI that's all you need, because it can't be masked by the CPU, so it always triggers it.

HOLD_LINE generally holds the line high until the CPU takes the interrupt (a bit of a hack but many drivers do this, and some hardware can auto-ack)
ASSERT_LINE holds the line until it gets cleared
CLEAR_LINE clears an asserted line

for the FBA cores, I'm not sure.

in MAME
 space.device().execute().spin_until_time(attotime::from_usec(100));

will cause the 68k to do nothing for a while, so that everything else (the z80, ym etc. can run) when otherwise it would wait until the next timeslice, bit of a hack because simply running with a tighter sync overall would probably be as good but at performance cost.

not really sure what else to suggest, maybe there's a bug with your z80, or timers in the ym if you're 100% sure everything else is good.

[Barry Harris]

Latch behavior is same as MAME's, nmi is triggered, the soundlatch is read, but soundlatch2 is never written. The sound irqs are triggered and cleared, but I'm not sure if they're fast enough? Everything else has been written and re-written.
I even tried to overclock the z80 a bit like you have to with Nostradamus (another Face shmup) in older MAME versions. No luck.

I had a quick look at it the other day and the YM was barfing. It does an IRQ at the beginning, lowers it, and then raises another, and then that's it. Never managed to find the reason though.

[dink]

Thanks for the info, Haze!

[dink]

Hmm, I've tried just about everything I could think of, and can't seem to get the z80 to reply after sending the nmi.  There's gotta be something we're overlooking.  It just won't write to z80 port 0x06, or read from the 2203 ports(dips)..

[iq_132]

Added driver for DJ Boy.

Also fixed a z80 bug with a little direction from Dink. This fixes the music in Raiden (and a lot of Irem games too!). ^^

[dink]

Tag-team fixes today!!  I got sound working in Air-Duel

[Huggybaby]

Awesome, goooo Irem!

[Arcadez]

Nice work fellas new games playable and sound fixes are always welcome additions to FBA 

[iq_132]

Started porting the Kaneko16 games that aren't in fba; Shogun Warriors and B. Rap Boys.

Shogun Warriors came right along after a little fudging around.
B. Rap Boys, for some reason, is stuck at the post.

[dink]

Nice!
btw, check your pm, I found some info re:brapboys getting hung @ crc check

[iq_132]

Nice!
btw, check your pm, I found some info re:brapboys getting hung @ crc check

I've already mucked around with interrupts. I'm not sure why it's fighting me.

[iq_132]

I came up with a small hack to bypass the check, implemented a few fixes, and hooked up save states. 

Code: [Select]

if (Kaneko16MCURam[0xE3] == 0x7F) {
Kaneko16MCURam[0xE3] |= 0x80;
}