How to play PCM along side of TFD driver

[Deleted]

So I was looking for ways to play WAV files as sound effects along side of Shiru's TFD Replayer, and I stumbled upon Mairtrus's WAV playback code:

Feb 26, 2010 8:45:50 GMT -5 Mairtrus said:

PlaySEGA:
poke &hA04000,&h2B ' DAC enable register
while peek(&hA04000).7  ' wait for busy
wend
poke &hA04001,&h80 ' the DAC is enabled now

poke &hA04002,&hB6 ' set mode
while peek(&hA04000).7  ' wait for busy
wend
poke &hA04003,&hC0 ' DAC is stereo now

poke &hA04000,&h2A ' adress of the PCM info

reload PCMData
for a=1 to #PCMLongitude
while peek(&hA04000).7  'wait for busy
wend
read Wave
poke &hA04001, Wave ' put the data into the YMH2612
halt ' small delay
next a
return
PCMData:
DATAFILE segapcm.bin,BIN where #PCMLongitude is the real longitude of the SEEEEGAAAAA sound in bytes.

When using this routine, it halts everything while this code executes. How would this be run along side of Shiru's TFD replayer to use as a quick sound effect? I know next to nothing about music programming or the z80, so any help would be greatly appreciated!

Thanks

[Mairtrus]

That's because this routine plays the whole PCM at once, without waiting the rest of the code for being executed. You can solve it by playing a few waves each frame:
...
If PCMLongitude>0 then
for I=1 to 8
while peek(&hA04000).7  'wait for busy
wend
read Wave
poke &hA04001, Wave ' put the data into the YMH2612
halt ' small delay
next I
end if or something like that.
The problem is that, usually, there will be no enough free time to make the pcm sounds 'continuous'. That's the reason why some games (i.e.: Sonic 1) uses the Z80 for the pcm playback...

[Deleted]

Well the sound clips that will be in WAV format will be less than 1 second long, so that *shouldn't* be too much of an issue, but I get what you're saying. I will try to fool around with it a little bit when I get home.

Is there any docs that you have links to for z80 programming so I can attempt to convert this over to the z80? I'm sure it's going to be way over my head, but I'll figure something out.

Also, one other question, which has to do with the reload statement:
If the TFM driver is using the Reload TFDFile, and this Wave player uses Reload PCMFile, will it screw things up? I'm not entirely sure how reload works - whether it can load more than 1 thing at a time, or if it overwrites the previous reloaded data.

[Deleted]

The RELOAD / RESTORE command simply sets the data pointer used by the READ commands .. with the READ commands automatically incrementing the data pointer value / address.