AY-3-8910 and the Replica 1
February 14, 2010 - 6:47am
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.
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
replica 1 The Apple 1 replica and the new Micro-KIM!
brielcomputers.com