ethan.dicks at usap.gov
Thu Jan 31 15:22:16 CST 2008
On Thu, Jan 31, 2008 at 08:40:35AM -0800, Zane H. Healy wrote:
> >Three chassis:
> > BA-23: complete with outer shell and end caps. It bears a
> > "MicroVAX II" label on the console switch panel, and has a
> > floppy drive (dual disk) installed in it.
> 22-bit, for the MicroVAX II CPU you have
A BA-23 will work fine for PDP-11s as well... they were sold as
"MicroPDP" systems. While a KDF11-A (half-height 11/23 CPU board)
will work, it's probably not the best choice, since a KDF11-A
is a CPU only, no peripherals.
In the MicroPDP line, one common low-end option was an -11/53
CPU board (can't recall the exact part number, but it might
be KDJ11-mumble). There was also the -11/73 variety (definitely
something like a KDJ11-B), the same J-11 CPU as the -11/53, but
clocked a bit faster (and originally priced a bit higher).
Some of the J-11 quad height boards have on-board memory (like
the -11/53), I think some do not. These are new enough that my
experience is a little fuzzy from the old days. I do have an -11/53
board w/1MB onboard, but it came from a different sort of box than
a BA-23, and I haven't played with it much.
Also, if you are inexperienced with Q-bus, you might not realize
that the BA-23 has two flavors of slots. In a standard MicroVAX
configuration, it really won't be a problem, as the CPU and memory
occupy the top three slots, the ones that are different. The bottom
six slots are idential and "standard" Q-bus. If you are trying to
configure something out of the ordinary, it will probably come up
as an issue. Not to fill a page with the details, but the keywords
are "CD interconnect" and "AB-AB" or just plain "Q22" slots. You
can probably search the message archives for this group and see
lots of details of Qbus backplanes being discussed here in the past.
> > I don't know the model numbers for the next two:
> > - One looks like a BA32 but smaller, and has the "3-switch" PDP
> > console/display panel on it. The cards are inserted from the
> > front beside the panel.
> Likely an 18-bit backplane for the -11/23 CPU.
>From your description, it sounds like a BA-11N, a very common
11/23 and 11/23+ enclosure.
> > - The last one is the smallest, looks much like the one above,
> > complete with 3-switch console/display panel, however instead
> > of metal side/top/bottom plates, it has a "wire cage". It also
> > has a second expansion chassis of similar construction with no
> > power supply or console panel.
> I'm guessing this is a 16-bit backplane for the -11/03
Another BA-11, but I forget the letter designation off the top of my
> >I've also got the following third party cards - I don't know
> >anything about these, other than the identifying marks found
> >on the boards listed below
> >Andromedia Systems UDC-11 rev H (50 pin connector at front edge)
> >Micro Technology Inc. MSV05B (x2) (50 pin connector at front edge)
> >TD Systems TDL-11H/A (50 pin connwctor at front edge)
> >Xylogics "Wizard 1" (50 pin connector at front edge)
> >SDC-RXVZ1 "8202 FD Controller" (50 pin connector at front edge)
I don't recognise those particular devices, but the MSV05B sounds like a
tape controller, especially with a pair of 50-pin connectors. That's
standard for a Pertec-formatted tape drive interface.
Andromeda makes a lot of powerful peripherals, especially disk controllers.
I don't know specifically what a UDC-11 is, but have a look for anything
that might suggest it's a SCSI interface (NCR or National SCSI controller
chips, three adjacent SIP resistor packs for termination...)
Xylogics was heavy into terminal servers and serial comms. Perhaps the
Wizard 1 is a multi-serial interface.
The part number of the DSC-RXVZ1 suggests it is at least a floppy
controller, but perhaps it is also a hard drive controller. If so, it
probably needs some external breakout board in the same way an DEC
RQDX1/2/3 does. If not, it might be just an 8" drive interface for a
raw drive like an SA800-series drive (not an RX01 or RX02). It would
likely _emulate_ an RXV11 or RXV21 at the register level, but use
inexpensive (at the time) non-DEC drives with a 50-pin interface.
Ethan Dicks, A-333-S Current South Pole Weather at 31-Jan-2008 at 21:00 Z
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Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
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