Hello,
I'm trying to design a sound card for the Replica 1 extension bus. Could some kind soul tell me how the AY-3-8910 can be interfaced by the 6502? I'm pretty sure there will need to be a 6522 VIA between the two chips for communication.
Anonymous
User login
Please support the defense of Ukraine.
Direct or via Unclutter App
Active forum topics
Recent content
Navigation
No Ads.
No Trackers.
No Social Media.
All Content Locally Hosted.
Built on Free Software.
We have complied with zero government requests for information.
The Mocking board for the apple II used a 6522 to connect to it, but I think it can connect direct. I could be wrong, I'd have to read the data sheet.
http://www.downloads.reactivemicro.com/Public/Apple%20II%20Items/Hardware/Mockingboard_A/Technical/Mockingboard%20Schematic.gif
That's the Mockingboard schematic using a 6522. Many of the bus signals are the same to the 6522 on the II vs the replica 1.
Here's a schematic without a 6522 to a Z80 machine I think.
http://www.simandl.cz/stranky/zxs/obrazky/ay_stereo.jpg
You should be able to connect it this way and save some logic.
Vince
Vince
If I were to use a design similar to the mockingboard... e.g. 6522 directly connected to the IO Bus, 6522 connected to the ay-3-8910, how could I program the AY-3-8910 chip through the VIA with Integer BASIC?