H7861 PSU issues
jnc at mercury.lcs.mit.edu
Thu Nov 2 08:25:38 CDT 2017
> From: Aaron Jackson
> Picked up a few 555s and sockets and now it works!
It's odd that a 555 failed, but sometimes there's no rhyme or reason to what
fails. E.g. I was fixing some broken M7859's (KY11-LB Programmer's Console),
and on one of them a 7493 (4-bit counter) had died. That's not one of the
'problem' 74xx chips, like ISTR the 7474 being?
More information about the cctalk