10 Mar
2016
10 Mar
'16
3:27 a.m.
Had my numbers mixed PLC-2 family 1772-M8 and -M16
Pretty bad since one is about 20 feet away from me
-pete
On Wed, Mar 9, 2016 at 6:20 PM, Jon Elson <elson at pico-systems.com> wrote:
On 03/09/2016 11:30 AM, Pete Lancashire wrote:
Before uP's many used bit slice's I'm
slowly putting together a
Westinghouse Numa-Logic 700 and 1200 setup. (BTW anyone have parts,
software, etc ?).
In my opinion Modicom was the best, did not need external cooling, A/B has
clout thus pretty much dominated. Did you know they used core at first and
some customers demanded it since it kept its ones and zeros when the power
went away ?
As far as I know, the 7300 never used core. No sign of anything like that
in the book. They did have a big backup battery for the DRAM, I used a
couple AH 12 V Gel Cell battery. The charger for the Gel Cell ran when the
control power was off, so it was supposed to maintain the memory
indefinitely - except the memory power switch had a dirty contact and would
dump the memory every couple of weeks.
Jon