M9312 Bootstrap Questions

From: Jeffrey Sharp <jss_at_subatomix.com>
Date: Sun Feb 23 03:26:01 2003

Ok, I got my PDP-11/34 mounted in its rack and have started to audit
jumpers, switches, etc. I am being cornfused by the M9312 bootstrap
terminator module.

First, I'm confused about what version of the module I have. My 11/34 user's
manual (EK-11034-UG-001 '77) talks about a -YA, -YB, and -YF version of the
board. My M9312 manual (EK-M9312-TM-003 '81) talks only in terms of
bootstrap ROM part numbers. The DIP switch references in the two documents
conflict, even differing on the switch settings necessary just to boot into
the console emulator.

My M9312 has no -Yx designator and has only one bootstrap ROM installed
(756A9 for RK03/05/05J or TU55/56). The M9312 manual seems to make the most
sense in this case, so I've been believing its side of the story. However,
the DIP switch settings on my M9312 have me puzzled. Here they are:

    1 2 3 4 5 6 7 8 9 10

This doesn't correspond to anything in either manual! According to the
manual I'm trusting, this says to start executing at 765406 (in the console
emulator ROM). It needs to be 765020 (with diags) or 765144 (without diags).

Supposedly, the machine was functional when it was decommed, so my first
instinct is to assume I am (or the docs are) wrong somewhere. However, its
previous owner (another collector) was not able **IIRC** to get a register
printout at power-up. So maybe the DIP switch is pointing to someplace that
isn't a valid entry point. I don't have access to the complete M9312 print
set, which would list the ROM contents.

Should I reset the DIP switch to say 765020?

Jeffrey Sharp
Received on Sun Feb 23 2003 - 03:26:01 GMT

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