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Adding SN76489 Sound Chip to Address Decoding?

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Dr Jefyll

Post subject: Re: Adding SN76489 Sound Chip to Address Decoding?

Posted: Wed Oct 13, 2021 6:58 pm

Joined: Fri Dec 11, 2009 3:50 pm
Posts: 3354
Location: Ontario, Canada

GARTHWILSON wrote:

RDY\ would imply that you ground it when you're ready to have the processor move on.

A bit of confusion, it seems, Garth. Unlike 65xx, on the SN76489, RDY is an output, so it'd be inappropriate to ground it. Otherwise I agree; when a pin named RDY is high it means ready. And when a pin named RDY\ is low it means ready.

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GARTHWILSON

Post subject: Re: Adding SN76489 Sound Chip to Address Decoding?

Posted: Wed Oct 13, 2021 7:04 pm

Joined: Fri Aug 30, 2002 1:09 am
Posts: 8433
Location: Southern California

Yes; I edited my post to say "put it low," so it doesn't sound like a hardwire grounding on the PCB. The SN76489 output would be the one putting RDY low, through an onboard transistor.

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