Though hardly less than 10 years old, it's on the topic of old
machinery...
A limiting factor for me (and I'm sure others) to put up 'obsolete'
documentation is hand scanning. Does anyone know of an inexpensive sheet
feed scanner that will accept 50+ sheets? These "all in one" type
things, like HP Officejet, only accept 10 sheets at a time, and do a
poor job.
Inexpensive meaning here a few hundred $US. Every few months I look and
never find anything between the officejet and $10K large-office
machines.
With a decent feeder I'd saw bindings off to sheet-feed manuals and
books I have duplicates of.
On Dec 12, 15:43, John Allain wrote:
> All the talk about Qbus PDP11's is getting me a little anxious.
> I have a bunch of *almost11* parts, but no machine.
>
> Does anyone want to sell/trade either:
>
> 11/53 PROM images 261E5.hex and 262E5.hex
Those ROM images have been sitting on my web site at
http://www.dunnington.u-net.com/public/DECROMs/ for nearly three years,
in response to a request from someone else on this list. I have a
fairly large collection of DEC ROMs (and always willing to accept
more).
Not all are on the website, for copyright reasons, but if there's a
good reason to make one available (eg to make a repair), and you can't
get it from DEC...
--
Pete Peter Turnbull
Network Manager
University of York
Ive got two copies of Rainbow Feb 1985 edition
Donald ducks playground on disk
VIP writer tutorial. No disks and the slipcase is missing.
Pay for USPS shipping and its yours.
Finally! Instead of just working on one, I'm going to try to build one
>from some components that I've collected. Trouble is, I'm not sure how to
put it all together. I saw mention of a QBUS howto, but the link to that
seems to be long gone. Would a kind soul care to assist on this?
This is what I have:
BA23 enclosure
M8190-AB (11/84 cpu)
M8067 (512k memory?)
M7516 (DELQA)
Dilog DQ686 (ESDI controller)
Maxtor ESDI drive (don't remember how large offhand)
I'm thinking that I have all that I need here, but I could be wrong. I
want to be able to run 2.11BSD on the machine...
Cheers,
Chris Cureau
On Dec 14, 17:47, Jerome H. Fine wrote:
> >Pete Turnbull wrote:
>
> > No, not true. There are both dual and quad 11/73 (the quad being
an
> > 11/73-plus). The 11/73 was 15MHz, the 11/83 was always sold as
18MHz.
>
> Jerome Fine replies:
>
> While I have heard of a PDP-11/23 PLUS, I don't think
> that "PLUS" was ever applied to the PDP-11/73 boards.
I doubt it was an official designation, it's just what we (CFM) called
them if they were in BA11-N boxes. The microPDP-11/73 machines in BA23
boxes always used the quad board, or course, so we never needed to
distinguish.
> >From what I understand, for the PDP-11/23 boards, the
> "PLUS" could mean either the ability to address all 4 MBytes
> of memory with the dual M8186 boards (I understand that
> the original M8186 boards were able to address only 256
> KBytes) or that the quad M8189 board was being used.
"plus" specifically meant the quad board, with the on-board boot ROMs,
LTC and SLUs. All but the very first of revision of the dual boards
can also address 4MB.
> As for the PDP-11/73 boards, I had heard that some
> did have the 18 Mhz crystal, but that might also have
> been done privately. Megan Gentry just mentioned
> that she changed the crystal on her PDP-11/83 board
> to 20 MHz and it ran correctly.
As far as I know, all the ones sold as 11/83 were 18MHz, all the ones
sold as 11/73 were 15MHz.
> > So does the 11/73, though it's different.
>
> This answer was with respect to the boot ROMs. I have
> both a KDJ11-BB (M8190-AB) and a KDJ11-BF
> (M8190-AE). Aside from the 15 MHz vs the 18 MHz
> crystal, the fact that the latter also had the FPU chip
> was standard with the KDJ11-BF. But the rev number
> of the J11 chip on the KDJ11-AB is 04 and the EPROMs
> are version 395E5 / 396E5 which can also be the EPROMs
> for the KDJ11-BF. However, I understand that the J11
> rev number when an 18 MHz crystal is being used must
> be at least 08 and maybe 09.
Then I'm sure that your ROMs must have been changed at some point in
the past. The 11/73 never had the same boot ROMs as an 11/83 unless it
was upgraded (which was quite common).
> So the dialogue for the PDP-11/73 and the PDP-11/83 can
> be identical - it just depends on which version of the
> EPROMs is being used.
Of course. The dialogue is in the ROMs, after all, and people did
upgrade them (to get the ability to boot newer devices, for example).
> All this discussion seems to point out that the PDP-11/73,
> PDP-11/83 and PDP-11/93 boards were not identical
I disagree -- I don't see anything to differentiate an 11/73 board from
an 11/83 from an 11/84, except the clock and the boot ROMs. Sure,
different revs of J11 were used. The original spec was for a 20MHz or
25MHz chip but it didn't meet the spec. Sure, there were FCOs and
ECOs, but they applied to both 11/73 and 11/83 (and presumably 11/84).
You've shown yourself exactly what I said, that if you use PMI memory,
the system thinks it's an 11/83 and if you use non-PMI memory, it's an
11/73.
> nor did they use the same J11 CPU chip all the time, although
> the last 09 rev CPU chip that was used with the PDP-11/93
> would probably work with all of the others, just NOT the
> other way around with the early 04 rev CPU chips.
Agreed.
--
Pete Peter Turnbull
Network Manager
University of York
On Dec 14, 14:01, Megan wrote:
> In fact, I have taken a KDJ11-B board with an 18Mhz clock,
> removed the clock chip and replaced it with a 20Mhz clock
> and the system ran solidly (I still have it). It also
> correctly identifies, in the boot rom, that the machine has
> a 20Mhz clock...
I've done that too. I also have a dual-height running at 18MHz, but I
know that one gets flaky at anything higher.
> I don't have specific information about an FP bug... I remember
> that some boards couldn't have the FPA installed due to some
> bug but don't have the specifics.
Somewhere in my piles of ol DEC stuff I have a note about which ones
can/can't/already do -- but I'm not sure exactly where it is, nor
whether that's an official original DEC document or a maintenance
company one. As far as I remember, it was described as a bug in one of
the ASICs.
--
Pete Peter Turnbull
Network Manager
University of York
On Dec 14, 13:43, Megan wrote:
>
> >Why do you think you want a PDP-11/74? That's one of the
"never-11s",
> >a machine designed but never sold. It's the biggest -11 ever made.
>
> Designed and *BUILT*... it is, however, essentially unobtanium...
That's why I said "never sold" -- I've seen photos but as far as I know
they're of a prototype.
> I have a line on one, but only if/when the person currently in
> possession of it ever tires of it.
That *would* be nice to have :-)
--
Pete Peter Turnbull
Network Manager
University of York
On Dec 12, 10:32, emanuel stiebler wrote:
> Patrick Finnegan wrote:
> > From what I understand, the 11/73 and 11/83 are both J-11 cpus, the
only
> > difference being that the /73 runs at 15MHz and the /83 runs at
18MHz.
>
> the 11/73 is a double, the 11/83 is a quad size board, 11/83 has also
> PMI, and was at the beginning a 15 MHz.
No, not true. There are both dual and quad 11/73 (the quad being an
11/73-plus). The 11/73 was 15MHz, the 11/83 was always sold as 18MHz.
> OH, and the 11/83 has a very nice verbose Boot-PROM ;-)
So does the 11/73, though it's different.
Source: personal experience of field servicing all of the above types,
plus the Micro-PDP-11 Maintenance manual.
--
Pete Peter Turnbull
Network Manager
University of York
Whats a good place to buy a few 500mb and 2gb IDE drives for projects? I have a 386 limited to 512mb and have a 486 that tops out at 2gb for dos and wanted to test a few older OS on them but ran out of drives. I need maybe 2 of each size dont care about brand as long as they are 3.5" hh drives (I have removable IDE cariers for them).
Looks like 6-8gb is the low end size liquidaters on the net are selling.
Today I picked up 3 UNISYS towers models UN6520-Z (2) and UN6065-Z50 (1).
Can't find anything using google anyone have some information on these
units? Thanks
