6 Jul
2014
6 Jul
'14
5:38 a.m.
I hate to open this discussion again, but Jack Rubin and I are both
repairing DEC Omnibus boards and need some DEC 8881 driver chips.
Since my PDP-8/e only has a 20 slot backplane and only has a few
boards installed I will try a lower drive SN7401 in place of the DEC
8881.
--
Michael Thompson
6 Jul
6 Jul
6:40 a.m.
I replaced a DEC8881 on the sense inhibit board with a 74LS01.
it is working as expected for me.
Marco Rauhut
Am 06.07.2014 um 14:38 schrieb Michael Thompson
<michael.99.thompson at gmail.com>:
I hate to open this discussion again, but Jack Rubin and I are both
repairing DEC Omnibus boards and need some DEC 8881 driver chips.
Since my PDP-8/e only has a 20 slot backplane and only has a few
boards installed I will try a lower drive SN7401 in place of the DEC
8881.
--
Michael Thompson
10:28 a.m.
When repairing a TU60 drive that had faulty DEC8881 I replaced them with
DM7439. They were $2.76 each when buying 25 pieces. The original faulty
chips were marked 7439 on the backside.
/Mattis
s?ndag 6 juli 2014 skrev Michael Thompson <michael.99.thompson at gmail.com>:
I hate to open this discussion again, but Jack Rubin
and I are both
repairing DEC Omnibus boards and need some DEC 8881 driver chips.
Since my PDP-8/e only has a 20 slot backplane and only has a few
boards installed I will try a lower drive SN7401 in place of the DEC
8881.
--
Michael Thompson
3597
days inactive
3597
days old
2 comments
3 participants
participants (3)
-
marco＠familie-rauhut.eu -
mattislind＠gmail.com -
michael.99.thompson＠gmail.com