SNES Programing Help 2

[tepples]

Does this engine use the echo effect at all? If so, does the instability on hardware go away if you disable echo?

[Khaz]

Aha. Well if it's echo that's causing the problem then I found out why. Here's an excerpt from "DSPInitData:" in SNESGSS's "spc700.asm" file (which I understand to be a transcript of the actual spc700 driver code) as of the version I've been using:

Code: Select all

	db {DSP_EON}  ,255						//echo enabled
	db {DSP_EVOLL},0						//echo (as global) volume to zero, it gets to the max after init
	db {DSP_EVOLR},0
	db {DSP_KOF}  ,255						//all keys off
	db {DSP_DIR}  ,sampleDirAddr/256		//sample dir location
	db {DSP_FLG}  ,%00000000				//no mute, enable echo
	db 0

That version was uploaded in December. As of the end of March there's a new version which changed to:

Code: Select all

	db {DSP_EON}  ,0						//echo disabled
	db {DSP_EVOLL},0						//echo volume to zero
	db {DSP_EVOLR},0
	db {DSP_KOF}  ,255						//all keys off
	db {DSP_DIR}  ,sampleDirAddr/256		//sample dir location
	db {DSP_FLG}  ,%00100000				//no mute, disable echo
	db 0

Looks like it was previously using the Echo volume for something, not too sure why.

I will try the latest SNESGSS when I get a chance/find it and see if it fixes everything.

EDIT: Had code samples backwards. >.<