In my opinion, the Datapoint 2200 on ebay seems to be a 1100 Cassette
Terminal.
There are two theories
- It is a true 1108, as the silver machine label indicates. This 1100
versions showed up in 1974 as described by the LCFGROUP and have been a
variant to the 2200 with less memory , using most of the 2200 parts,
except the power supply at the back. This has been re-designed. The
Datapoint 2200 on ebay is most likely a 1100. But it has the 2200 logo
at the front, how can this be ? Ken Whitehead may have the answer for that:
StaTuesday 17th July 2012
Ken Whitehead (USA)
Other comments re: confusing the 1100/2200/5500/6600 may have arisen
>from the fact that all of the enclosures for these models started life
with 2200 molded into the plastic bezel. The 1100, 5500 and 6600 models
had a separate logo that was applied over the existing 2200 logo. Since
double-stick foam tapes were used, over time the tape let loose and the
?new? logo fell off. We had a few customer complaints re: the instant
downgrading of their computers when this happened! Alas, we know that
for all of those that complained, many more didn?t, giving possible rise
to the confusion of what the machine actually was.
- My second theory is, it is one of the 1100 terminals, that have been
upgraded to a 2200, yes that was possible.
The Dataform_1100_Brochure_1974 says: System Expandability. The 1100
user need not fear an application outgrowing an 1100's capabi lit ies.
If additional data input locations are required, the 1100 can be
upgraded to a Datapoint 2200
DATASHARE System.
Seems this was offered along the introduction of the 1100, about 3 years
after market introduction of the 2200.With this upgrade came extra 8kb
more memory (2 more RAM boards) and a new front cover or removal of the
1100 logo plate ?
In any case it is not a Datapoint 2200 as advertised. A real 2200 looks
like this: http://datapoint.vintagecomputers.square7.ch/index.html
Anyone with another good explanation ?
Thomas
Sun Nov 28 13:27:20 CST 2021
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Noticed a Datapoint 2200 on ebay....
https://www.ebay.com/itm/275043446827
They're asking $48,000
I want one...but not for that price! :)
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Hey list,
I received a note today from a fellow in London who has 2 9-track tapes
that he'd like read. Brands are CDC and BASF, so media shedding should
not be a problem. Dates are '92 and '93, so likely 1600 or 6259. The
tape seal on one (the other has no seal) is IBM-style, which may be the
system that produced the tapes.
Any takers? Let me know if so, I'll put you in contact and you can take
things from there.
All the best,
--Chuck
> From: Guy Sotomayor
> I don't unfortunately have any light masks
Dave Bridgham and I were manoeuvreing to be able to produce clones of the one
you loaned me (he has access to a computer-controlled milling machine at his
maker-space or whatever the name is for them now, and we bought a good-sized
sheet of the required plastic to be able to crank them out) when I came down
with COVID early in the pendemic, and in the aftermath (I came down with
long-haul post-COVID Chronic Fatigue Syndrome) itgot put on hold. The loaner,
and a micrometer to measure it, are still siting on the table in my family
room, next to my desktop.
If anybody needs some, I can probably try finishing the drawing, and get it
to Dave, so we can resume that project.
Noel
> From: Ed Cross
> I'm currently restoring a PDP-11/70 system and need the following
> boards to complete the CPU: FP11-C
>From your mention of the FP11-C, I gather your -11/70 has a KB11-C (later)
CPU, not the KB11-B CPU of the earlier PDP-11/70's (prior to 1976 - the
difference between the two was whether they took the optional FP11-B or FP11-C
FPP).
Not that it makes a big difference in your case; the 4 cache cards are the
same in both.
There used to be a seller on eBait (on the mid-East Coast - Baltimore, IIRC)
who was selling -11/70 CPU cards (I bought a whole spare set from him) but
alas he seems to have gone away (or sold them all; a quick search, both on
eBait, and in my email, didn't turm him up; I can institute a deeper search
if need be).
>From the blog of someone who got a KB11-A working, you'll really need KM11
cards; dunno if Guy Steele still has those clones he was selling.
There are definitely some versions of Unix which will run fine on -11/70's
without the FP11 (e.g. V6). The system binary is different for the
with/without versions, though: in the assembler code which saves the state of
one process before switching to another, there is code like:
stfps (r1)+
which will probably get an illegal instruction trap in kernel mode on a
machine with no FP11, and is therefore conditionally assembled (depending on
if the particular machine the system is being built for has an FP11). Perhaps
the later BSD versions look for the FP11 on startup, and adjust their
behaviour appropriately, but I'm not familiar with them.
V6 as distributed contains system binary for an -11/40, which will run on
_any_ -11 UNIX will run on, and can be used to build appropriate system
binary.
(Diversion: I've never found out whether the KB11-B and KB11-C of the -11/70
used/could use the same backplane or not. By examining the prints for the
boards of the FP11-B and FP11-C, and seeing on which pins they exchanged
signals, and what signals they exchanged with the rest of the CPU, and on
which pins, it should be possible to work it out. Ditto for the M8133 ROM and
ROM Control of the KB11-B, replaced with the M8123 in the KB11-C.)
(Interesting factoid: the M8123 is the only card shared between any variant
of the -11/45 and -11/70: both the KB11-C and KB11-D use it. Of course, I
think we're still missing a wirelist for the -11/70 backplane, of any
variant; and the ECO history. There appears to have been at least one poorly
documented upgrade; see here:
http://gunkies.org/wiki/MK11_memory_system#CSR_Access
for more.)
Noel
