Unknown TI logic series
hilpert at cs.ubc.ca
Sun Dec 19 13:26:21 CST 2010
On 2010 Dec 19, at 10:28 AM, William Donzelli wrote:
> And as for DEC - remember that they sometimes used ICs in somewhat
> unorthodox ways that may not be tested for back at the vendor. It seem
> to recall that one of their favorite tricks was to use some of the
> internal "diodeness" of the input and output pins of line transmitters
> and receivers for clamping.
I'm reminded of the PDP-8/m front panel problem discussed on the list a
few years ago, where the design was relying on non-specified behaviour
of an IC type and turned out to be very dependant on both the
manufacturer and time frame of IC production.
(Collector triggerring of a 74175 FF:
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