13 Nov
2006
13 Nov
'06
4:22 p.m.
On 11/14/06, Jim Beacon <jim at g1jbg.co.uk> wrote:
From: "Gooijen, Henk" <henk.gooijen at
oce.com>
I've run into that sort of situation before - we had a COMBOARD
customer with an 11/750... everything worked in the machine except our
board. Turns out that we really needed -15V from the Unibus and
nothing else in the machine did, even though the console serial port
"worked". Getting them to get their -15V PSU repaired got us up and
running, too.
-ethan
So, Don ... cache is indeed optional, UBI (as I
found out) is not!!
Tomorrow I will check the power supply voltages. +5.1V is expected
to be OK, but the +/-12V ... hmmm, how come that the RS-232 signals
to and from the VT100 are working ...?
Because the VT100 will accept valid signals down to about +/- 3V before it
gets confused (a lot of people get caught out on PC serial ports, as they
don't usually drive to the full RS232 levels, and some kit needs the full
level).