The 2N2/256-BSCP [was: Homebrew Drum Computer]

Mike Hatch mike at brickfieldspark.org
Fri Dec 21 11:55:02 CST 2007


> From: Brent Hilpert <hilpert at cs.ubc.ca>
> Subject: Re: The 2N2/256-BSCP [was: Homebrew Drum Computer]
>
> Another approach to discrete flip-flops can be seen at:
>
>  http://www.cs.ubc.ca/~hilpert/eec/misc/CasioAL1000Tech/electronics.html
>
> The stacking of multiple inputs into the basic FF structure was another
> technique from the discrete days. Helps reduce the amount of gating (and 
> hence
> transistors) required, for instance when making a parallel loaded shift
> register or counter, although they were lots of other novel uses. (Some
> aspects of logic design were narrowed with the introduction of ICs for the 
> sake
> of standardizing on elements that would fit in packages with limited 
> connections.)
>

Very similar to an East German calculator that I am partway through reverse 
engineering, a Soemtron 220.
www.soemtron.org/downloads/board10.pdf

http://www.cs.ubc.ca/~hilpert/eec/misc/CasioAL1000Tech/electronics.html
Looks like thees pages might help in that task thanks for the link

Mike.








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