You guys can thank UniWarS for this one... (Galaxian?)

[You guys can thank UniWarS for this one... (Galaxian?)]

3 hours ago, bhall408 said:

It displays "POKEY NOT FOUND" in Argon... If you can spin a build with the proper bits set in the A78 header, I can try it again.

 

What does your pokey detection code look like? Maybe we'd want to support/detect that as well (as the header bit). @ZihuaCode

 

Is there harm to an emulator *always* having the chip present?

Which .a78 binary are you checking with? I haven't had any luck with the one with md5 hash 8137c820ccd9eb7a677287b44b50083a, which I edited the header of to indicate pokeys at $450 and $4000 (should cover the bases, attached)

I did have a look at the sound effect .asm files, but I couldn't locate anything that looked like it was doing detection.

Galaxian P450_P4000.A78

["Dragonfly" my version of the Atari 7800 SD cartridge]

37 minutes ago, RevEng said:

bits 2 and 3 it is

Great -- so `header[53] & 0x04` indicates pokey at $440, and `header[53] & 0x08` indicates ym2151 at $461/462.

["Dragonfly" my version of the Atari 7800 SD cartridge]

1 hour ago, Muddyfunster said:

This is exceptionally good. It almost sounds like SID but a little softer which is nice.

 

Here it is playing in Argon:

ByzexByTatqoo240Hz.aac

["Dragonfly" my version of the Atari 7800 SD cartridge]

13 minutes ago, RevEng said:

You can implement with bit 8 of the cart-type word at offset 53. (i.e. the low bit of 54) I think we also likely need to implement the next bit up as a flag for stand-alone YM2151 at $461/2. I'll put in the announcement when I get a sec, if you like

MAME currently uses the value 1 and 2 (thus bits 0 and 1) of 53 to indicate A78_ACTIVISION and A78_ABSOLUTE.

Maybe we should use bits 2 and 3 for POKEY 440 and YM2151? Or perhaps leave that bottom nibble alone and use bits 6 and 7.

 

["Dragonfly" my version of the Atari 7800 SD cartridge]

I'm working with @bhall408 on Argon, which is based on MAME for 7800 emulation.

 

I took @rj1307's `outrunjazzed.a78` and changed the cart type field to $41, which would normally indicate a second pokey at $4000. I modified `a78_rom_p450_pokey_device` so that it's actually at $440. We're panning $450 mostly right and $440 mostly left, and it sounds really nice (see attached file).

 

I wonder, is there a mechanism by which we can get the .a78 format extended to indicate that a cart expects to see a pokey at $440?

AcidJazzedStereo.aac