PDP-11/44 problem - RUN stays on

[Jim Beacon]

From: "Gooijen, Henk" <henk.gooijen at oce.com>


>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).

Jim.