Quote:
Originally Posted by GeraldSommariva
On the Keyboard there is a TTL 7403 of which one of the outputs (pin 3) is dead so yet another TTL chip that has suffered, so thats 6 TTL chips so far.
I thought the TTL 74xxx logic family was very robust ?
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Well TTL IC's normally are fairly robust - compared to MOS types (especially more complex Memory / Processor / custom gate array etc. devices)
Although it does seem that your PSU may have gone a bit over-voltage at some point, so may be lucky if it is mostly TTL IC's that have failed and not too many expensive & rarer larger MOS ones.