4 Jan
2015
4 Jan
'15
12:03 p.m.
On Sun, 4 Jan 2015, Robert Jarratt wrote:
When I power up my DECsystem 5100 I get the output
shown at the end of this
email. I thought this was to do with the DS1287 chip as it seems be an NVRAM
battery error (perhaps). Since I know these devices fail I took out the
DS1287, put in a socket and then bought a replacement DS12887A. But I still
get the same problem. It could be that I bought a bad replacement, or that I
have done some damage in my desoldering of the original, or it could be that
the error is something completely different. In fact the Maintenance Manual
suggests test 9 is to do with the DZ, and I can't find what test 4 relates
to.
How does the DDS12887A compare in speed/timing compared to the original
DS1287 I know with Suns some 150ns ones don't work, yet 100ns or 200ns or
whatever are fine.
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects