RAW PSG Programming?

Supporter (10)

11-09-2015, 22:29

Hey all. I am very new to the MSX, and am excited to learn about this system. Very cool stuff!

One of the things I am most interested in is learning how to make sound effects with/on the stock AY-3-8910 sound chip, programming the PSG "raw". I would like to use BASIC to make simple calls to the chip. Can anyone share starter links/resources to do that?

I am currently running OpenMSX on a Windows PC, still shopping for real hardware.

Thanks!

By ARTRAG

Enlighted (6935)

12-09-2015, 08:13

Hi
In basic using the sole sound command it is hard to get something decent.
The best solution is to use a replayer on the ISR able to update the psg regester at each interrupt.
In this latter case look for aysfx edit or for SEE on the forum. Their players can be called from basic using USR()
They come with sfx editors for windows and there are quite a lot of free sfx already on the net.

If you want to use basic only, you could try to use on interval gosub and code your own ISR that loads the psg registers using the sound comand, It would be possible but not very efficient.

By ARTRAG

Enlighted (6935)

12-09-2015, 11:37

Btw the command

Sound n,x

Allow to write the value of x in register n of the ay8910

By Lord_Zett

Paladin (807)