RTL logic circuts MC 660 and MC 672
Dan Michaels email (remove spam text)
Sven in Sweden wrote:
>In the early 70's RTL logic circuits preceded TTL. I am about to repair
some old X-ray equipment fom that era, and need mentioned IC's for the purpose.
>I have been unable to locate these in ordinary ways. If you collect stuff
the way I do, you might have some....
Sven, if worst comes to worst, and you still must fix this equipment,
you may be able to get by with cutting out the chips and soldering on
some discrete NPN inverter circuits. That is really all RTL was.
Somewhere I have an old textbook showing nominal resistor values.
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