24 Jan
2013
24 Jan
'13
4:54 p.m.
From: "Roe Peterson" <roe at liveblockauctions.com>
Sent: Thursday, January 24, 2013 4:07 PM
To: <cctech at classiccmp.org>
Subject: pdp11/34 strange problem indeed.
I'm restoring a pdp11/34a, and I've got a weird problem I'm hoping
someone out there can help me with.
The system seems to be working just fine, with one exception: bus reset
just doesn't work.
The unibus is configured correctly; I've verified that NPR is
jumpered/granted correctly through the bus. This is a BA11-L box with
the DD11-PK 9-slot backplane, configured like this:
Slot 1 - CPU
Slot 2 - CPU
Slot 3 - A/B M9312 bootstrap/terminator, C/D/E/F M7859 front panel
programmers interface controller
Slot 4 - 128 Kword MOS memory
Slot 5 - RL11 controller
Slot 6 - C/D/E/F M7856 DL11-W console RS232 interface
Slot 7 - C/D G7273 dual bus grant
Slot 8 - C/D G7273 dual bus grant
Slot 9 - A/B M9302 terminator, C/D/E/F M7856 DL11-W configured at 776500
for TU58 tape drive
[... snip ...]
I have not been actively busy with my 11/34C for quite some time,
but the first thing I noticed is the use of slot 3. I am not sure, but is
the 3rd slot not dedicated for FIS or CACHE? If you move all boards
(slot 4 to slot 6) up one slot, I'd put the G7273 from slot 7 into slot 3.
- Henk, PA8PDP
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