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Old 3rd Jan 2019, 1:42 pm   #6
Karen O
Rest in Peace
 
Join Date: Jul 2011
Location: Bridgnorth, Shropshire, UK.
Posts: 787
Default Re: Retro computer homebrew: Orton Karenbak-1 computer

Thank you all for your kind comments.

It was some time in the making, and the objective changed several times.

Originally it was to be a computer using 100 transistors or less.

That might still happen, and looks possible given that there are only 30 flip flops.

Initially, the delay memory was going to be cassette tape.

I was going to use a combined record/play head, which would provide a delay of some 90 milliseconds.

Trouble was, that'd result in only six instructions per second.

With the BBD delay it can achieve a wopping 100,000,000 microinstructions per second
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