AY-3-8910 and the Replica 1

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shiftkey's picture
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Joined: Feb 10 2005
Posts: 51

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.

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Joined: Dec 20 2003
Posts: 249
The Mocking board for the app

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

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shiftkey's picture
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Joined: Feb 10 2005
Posts: 51
If I were to use a design sim

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?

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Shiftkey