TTL 7400's Available

Chuck Guzis cclist at
Mon Jan 1 20:44:34 CST 2007

This talk of making flip-flops brings to mind a topic not mentioned 
much at all any more--that of AC-coupled logic.  Does anyone own any 
CPUs constructed using this logic type?  I realize it was more common 
when thermionic devices (tubes/valves) were used, but I do recall 
seeing some transistor and tunnel diode circuits using AC coupling.


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