On Sat, 20 Oct 2018 11:50:51 +0100, James Harris
<
[email protected]> wrote:
Whether such a piece of kit would be generally useful or not, such an >analyser wouldn't help in this specific case as it could not be used to
check the above decoder without also using a test program to cycle
through the inputs. The decoder is not socketed so I guess all I can do
is unsolder the chip and test the 16 permutations of its inputs on a >breadboard. If I'm wrong and there is a better approach please say!
I have a piece of old kit (Fluke Trendar 200 IC Testclip) that we were
issued with when TTL was mainstream. It has a 16 pin clip to attach
to the suspect DUT and a 16 pin socket. A number of special socket
can be plugged in to the one on the unit. Each special can have long
or short pins - long pins connect to the input of the DUT short pins
only connect to the exclusive OR gates which drive the LEDs. A good
IC is placed in the socket and the leds indicate a difference between
the good and DUT outputs. There is also a pulse stretcher which can be
switched to any pin.
Some info on google and at least one on ebay:-
https://www.ebay.co.uk/itm/VINTAGE-FLUKE-TRENDAR-200-IC-TEST-CLIP-WITH-CASE-MANUAL-CABLE-PINS-REFERENCE-/232452265430
if that wraps then:-
https://tinyurl.com/y7oawq4k
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