Anyone have the mod for the Apple communications card to run at 600 or 1200 baud from 300

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June 26, 2013 - 10:02am
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Corey986
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Anyone have the mod for the Apple communications card to run at 600 or 1200 baud from 300

I want to hook my Apple II up to my paper tape punch which runs at 600 or 1200
Baud.

I have a 1978 apple communications card and need to make the mod for higher speed rates.

Thanks,
Corey

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June 26, 2013 - 10:24pm
Mike WIllegal
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Last seen: 4 weeks 22 hours ago
Joined: Jun 5 2008 - 07:26
Posts: 451
Re: Anyone have the mod for the Apple communications card to ...

The schematics can be found online. It looks like a couple of 74161s are used to divide down the 1 MHz system clock to make up the baud rate clock. I don't have time to do all the math, but if you change the preset settings on the 74161s, you change the baud rate.

Regards,
MikeW

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