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Old 18th Jan 2019, 7:17 pm   #32
Karen O
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Join Date: Jul 2011
Location: Bridgnorth, Shropshire, UK.
Posts: 787
Default Re: Retro computer homebrew: Orton Karenbak-1 computer

Hi John,

You can mix LS TTL and HCMOS but you have to add pull-up resistors wherever an LS output drives a HCMOS input. Bear in mind that some HCMOS gates are Schmitt triggers and are used for generating delays.
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