IanK at vulcan.com
Thu Mar 26 09:58:42 CDT 2009
The Data Systems Design A44324 board is to interface a DSD440 to a Qbus. ISTR the other DSD board is probably another DSD440 interface - they also made them for Unibus and Omnibus. -- Ian
From: cctalk-bounces at classiccmp.org [cctalk-bounces at classiccmp.org] On Behalf Of Pete Turnbull [pete at dunnington.plus.com]
Sent: Thursday, March 26, 2009 1:32 AM
To: On-Topic and Off-Topic Posts
Subject: Re: PDP-11 bootup
On 26/03/2009 05:34, John Floren wrote:
> Here is a complete list of the boards in my system, as removed from
> top to bottom (this was a rack mount unit)
> 1x M8192
> 1x M7195
> 1x mysterious quad-height board from DEC; I can only find labels
> saying "PC304135-I4", "0202", and "Rear PSW1-0"
> 2x Matrox QRGB-G-64/4 boards
> 1x Matrox QVAF-512/8A (or QVAF-5/2/8A, hard to read)
> 1x Dataram 40903 (memory? It's got tons of little ICs)
> 1x M7941
> 1x M7555
M8192 is a dual-height KDJ-11A for an 11/73 and as Jerome pointed out
that has no bootstrap. Possible reasons for being left at the ODT
prompt include the HALT switch being on, or there being no bootstrap
anywhere else. However, the next board, M7195, is a multifunction
MXV-11B, which probably does have a bootstrap on it. Look for a pair of
EPROMs on it. The manual is around the net, and I expect there's a copy
The KDJ-11 doesn't have all the ODT commands that some earlier QBus
processors have. "G" is the command to "Go" to an address. "P" is the
command to "Proceed" without initialising the bus. The only other
commands on a KDJ-11 are slash ('/'), 'R', carriage-return and linefeed.
I don't know exactly what the next few boards are, though I know Matrox
made video boards for a variety of systems (DEC and S100 at least) and a
QRGB is some sort of framestore and QVAF is a digitiser, I think. The
Dataram board probably is memory, especially if densely packed with an
array of chips. The chips numbers should tell us.
M7941 is a DRV-11 parallel interface, which might have been used for a
printer or simply for some other digital I/O to/from another device.
M7555 is an RQDX3 MSCP disk controller, which interfaces via a breakout
board to a dual floppy drive and/or one or more ST412-style hard drives.
Are there disks and cables in the system?
Thinking of that, what type of box is this in? What does the front
panel look like? Jerome suggested it might be a BA23, but this mixture
of cards suggests to me that it might just as well be a system that was
upgraded from something older, and that it could be a BA11S or BA11N.
> Here are all the boards I have that were *not* installed:
You appear to have boards from at least three systems...
> 1x M9400
This is a terminator board for a much older QBus system.
> 2x M7946
Each is an RXV11 controller for a dual RX02 8" floppy drive - not useful
unless you also have those specific drives.
> 1x TI GPIB11V-1
I don't know, but I'd guess some Texas Instruments GPIB/IEEE-488
instrument interface, like DEC's IBV11.
> 5x M8045
Older QBus memory card from an 11/23 or possibly 11/03 system. There
will be a suffix to the 8045 that will tell us the size of each. The
have parity, so possibly from an 11/23.
> 1x Data Systems Design A44324
> 2x M8043
DLV-11J quad serial line cards, mainly used with 11/03 and 11/23
systems. Later versions were renamed DLVJ1. They'd probably work
(depending on the revision level) with your 11/73, but as you have two
serial lines on the MXV11, probably not very useful.
> 1x M8192
Another KDJ-11A CPU.
> 1x DT 2766
> 1x M7195
Another MXV-11 multifunction card.
> 1x M8059
MSV-11L memory from an early microPDP-11, either 128KB or 256KB.
> 1x M7270
This is an old dual-height LSI-11/2 CPU from an 11/03 system.
> 1x 3com board, all I can find is "QE serial 0223-01". It's dual-height
> 1x Data Systems Design 804140
> 1x M9400
Terminator for that LSI-11/2 processor system. Does the number have a
suffix? There were several version, some with bootstraps.
> 4x M8013
Here you have the upper halves of four RLV11 disk controllers. These
each need to be paired with an M8014 to do anything. They're from an
11/03 or early 11/23 system.
> 1x M7856
A DL-11W serial line and line-time clock from a Unibus system. Don't
plug this in to your Qbus!
> 2x Matrox QRGB-G-64/4
Matrox framestore, I believe.
Pete Peter Turnbull
University of York
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