Adding SN76489 Sound Chip to Address Decoding?

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Dr Jefyll
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Re: Adding SN76489 Sound Chip to Address Decoding?

Post by Dr Jefyll »

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
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Re: Adding SN76489 Sound Chip to Address Decoding?

Post by GARTHWILSON »

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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