So I guess someone:
https://www.ebay.com/itm/324151272982
is a majot PDP-6 fan
Noel
> From: Dwight Kelvey
> There was a fellow that made a relay logic that could play tic tac toe
What's with these new-fangled devices using _electricity_ anyway? :-)
In high school, my math teacher (I think it was) used a couple of matchboxes
and some beads to create a TTT device; he
> It includes a table which says which chip each bit in the memory is
> stored in
Oh, there's an entry (well, actually two) missing from the table, which is the
parity bits (2; byte parity); I'll work them out and add them. (I know, by
elimination, which two columns of chips are the
> From: Aaron Taylor
> I can confirm that the DEC MSV11-R is a PMI card. I own two and have
> used them with my KDJ11-B. ... the board is recognized as PMI by my
KDJ11-B.
Also, in a fairly amazing bit of sleuthing, Jerry Weiss found (in some of the
early PR versions of the -11/84
So, I've come across an odd book that might interest some here: "Achieving
Accuray: A Legacy of Computers and Missiles", by Marshall William McMurray.
The first couple of chapters merely re-tell the story of earliest computers
(pre-elecronic and electronic), up through the IBM 701, Elliott 401,
> From: Fred Cisin
> we can start by considering the 4004. 1971. ... Then came the 8008,
> with EIGHT bit data bus, and 14 bit address bus (16K of RAM) ... It is
> important to note that each Intel chip consisted of "minor" modifications
to
> the previous one.
I know you
> From: Ethan Dicks
> a DEC sync serial board since that part is nowhere to be found right
> now.
I dunno, I see them fairly often on eBait (well, often compared to some other
things, e.g. TU56 parts... :-)
QBUS or UNIBUS? And there are lots of different ones, which I confess I
> From: Chris Hanson
> There's an MXV11-B (M7195) on its way to me. :)
Wow, you've got a really good fairy god-mother!
I've been trying to buy one on eBait for some time now (in part to have one
to take a photo of for the CHWiki), and no luck - they always get bid up into
the sky. And
> From: Chris Zach
> Might have an older MXV11 as well, could the 18 bit one do this
Ooh, good catch; yes, the MXV11-A also has an LTC. I too have an 'extra' one.
The OP should probably check to see if his P/S generates the bus clock signal;
most of the options we've discussed for him
Hi, I'm trying to ID this:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/QBUSMystMem.jpg
mystery QBUS memory card. I think it's a 64KB card, so not very important, but
it's bugging me. The company logo (lower left corner) looks familiar, but I'm
not good with off-brand logos; I'm hoping someone
> From: Ethan Dicks
> ODT works from my 11/34 with bad RAM,
?? The -11/34 doesn't have 'real' ODT (like the one in the LSI-11's,
KDF11's, KDJ11's), which is in microcode).
The M9301 and M9312 bootstrap ROM boars contain a console emulator, but it's
in macrocode.
Noel
> From: Chris Zach
> Next up is the 11/24, this is one of the 5.25 inch rack mounts with a
> CPU, KT24, and no memory.
> First question: Will ODT respond at all with no memory on the Unibus?
My _guess_ is probably, since on other KDF11 CPU's, ODT works with no
memory, but I
> From: Guy Sotomayor ggs at shiresoft.com
> It looks like it's 11/84 from the badge on the front.
In a 10-1/2" box. Seen them in the docs (forget the model number), never seen
a real one.
Noel
> From: Chris Zach
> still nothing coming out of the serial port. Figured I would document
> the settings and see if anyone with an 11/24 can cross-check my settings.
Time to stop trying random things and drop the (metaphorical) Big Hammer.
Look at the bus, and see if it's trying to
> anyone willing to chip in some money to help me pay for this?
I sent a chunk too. This is a totally great acquisition: I have a KDJ11-B
board that has a bad bus driver chip; I was going to apply an ohmmeter to find
the guilty party, but just looking at the prints will be so much easier.
I
After having a run of almost half a dozen IDE hard drive failures recently in
a short period of time (on my older desktops which use them, I've decided that
I should see if there's an IDE emulator (using SD cards) available I could
switch to. (I'm not sure why I had so many failures in such a
> From: Warner Losh
> If we can't use MINIUNIX to rebuild MINIUNIX kernel, should we try to
> bodge together rebuilding via apout?
Good basic idea (using a different system to build on), but there's a
better/easier approach (in the same basic vein): bring up V6, and mount the RK
pack
> From: Liam Proven
> Would the x86-32 "reimplementation" of v6 UNIX be able to mount and/or
> read-write such filesystems?
No, it looks like it uses a different fie-system layout.
Besides; there's not much point: the big adantage of using V6 is that one can
use the V6 tool-chain to
> From: Lars Brinkhoff
> There are emulators for the CADR Lisp machine ... There's no emulators
> for the CONS, but I claim it would be interesting to attempt one.
I'm not sure CONS ever ran as a stand-alone system; I suspect (but don't
recall for sure; RG, TK or Moon or someone
> From: Liam Proven
> for my continuing education: what's a "Mini-Unix binary"?
Two possible meanings; a system image for a Mini-Unix system (buildable under
V6 with the standard V6 tool-chain of C-compiler/assembler/linker), and user
command binaries (buildable with the
> From: Chris Hanson
> My little LSI-11 system doesn't have a usable Line-Time Clock because
> it lacks the register, which it expects to be in either an MXV11-B
> (M7195) or a BDV11 (M8012). My power supply theoretically supplies the
> LTC .. so my preference would be an
> From: Bill Degnan
`
>> I think I have a spare set of boards for the controller.
> I might be interested if no one else wants this.
You'll need a backplane too - and that's non-trivial. (I'm in the process of
producing one for a KE11-A.) The RK611 is a 9-slot (although several slots
> From: Jon Elson
> As far as I know, there was no VM/360. There WAS VM/370, which was out
> in the early 1970's
CP/67, which was a semi-product, and ran only on 360/67's, was basically the
same functionality as VM/370. (I get the impression that the code was
descended from CP/67,
> From: Lars Brinkhoff
> it was AI rather than MC. As I'm sure you know, AI had the Rubin 10-11
> interface
Really? (I expect you're correct, mind.) I just remember one day MC wasn't
running as normal, and I was told it was because CHEOPS was in some
tournament, and MC had been
> From: Richard Sheppard
> There's a piece of core on eBay .. which claims to be H214. The
interesting
> thing is the label says 8K x 16 but the silkscreen says 8K x 19.
DEC did that a lot; used one silkscreen (and etch) for two different modules,
with differing componet sets to
> (Whether that's all done on the companion driver boards, and the H21x
> card would just bring the wiring of the two banks out to the edge
> connector in parallel, letting the driver board do what it wants, I
> don't know - you'd have to look at the MM11-L engineering
> I will create a page which lists the contents of the APH .. I'll email
> the list with the URL once I get it up.
OK, it's at:
http://mercury.lcs.mit.edu/~jnc/tech/arpaprot.html
I'll link to it from all the usual places (e.g. the 'ARPANET Technical
Information' page) later. The main
> hyperlinked in; I'll do the RFCs later. Also, it's missing a few TELNET
> entries, I'll add them later too.
All done.
Also, I remenbered that Dave Walden made the three main ARPNET papers
availalble online recently, so I added links to them on the 'ARPANET Technical
Information' page.
> From: Camiel Vanderhoeven
> I know Intel made the in-4011 for the PDP-11, but I never saw a picture
> of it.
Was it UNIBUS memory, or what? It doesn't seem to be in that table of early
Intel products.
BTW, speaking of Intel PDP-11 memory, I have this:
> From: Paul Koning
> airfight and any number of other multi-user games -- a thing made
> popular by PLATO and possibly originated there.
What was the date on that? Multi-player MazeWar on the Imlacs/ITS at MIT was
running before 1976 (I played it about then), but I don't recall
> From: Peter Dick
> Question: how do the three of you (Noel) cctalk@classiccmp.org and Paul
> Koning fit together?
CCTalk is a mailing list for people who collect antique ('classic') computers;
Paul and I are both members. I collect PDP-11's (I used them in school from
'72 to
> From: Paul Koning
> RSTS/E of course has a bunch of new stuff in it to deal with mapping,
> but the bulk of the code carries over from RSTS-11.
I was assuming that the basic intermal environment was sufficiently different
that not a lot of the OS-level code could carry over, but I
https://www.ebay.com/itm/224058116598
Noel
Love the title on this:
https://www.ebay.com/itm/184317705963
eBait auction: "16K Sense Inhibit Board .. VAX 6000, VAX-11/730".
Yeah, core on a VAX! And such a deal, a mere US$400!
Noel
This eBait item:
https://www.ebay.com/itm/202989416368
has a number of VAX-11/785 manuals, including /785 Hardware User's Guide. A
bit outside my scope, but /785 docs are very rare (Bitsvers only has prints)
so a VAX person should grab this and then scan them.
Noel
> From: Will Senn
> I know some of y'all were there (Noel)
I'm you're huckleberry (sort of; I didn't work on building the ARPANet, but I
built a number of boxes which were attached to it, later).
> I'm looking for the ARPANET Protocol Handbook
I have a hardcopy; the January 1978
> From: Steve Shumaker
> NTRL has 3 published versions listed with two available as pdf downloads;
> https://ntrl.ntis.gov/NTRL/
Good find! The ADA052594 one is the one I have. The other one has older
versions of
some things.
So I won't need to scan anything; but I will put up a
> From: Peter Van Peborgh
> From: Antonio Carlini
> From: Jim Stephens
Everyone: please DO NOT send messsages to CCTalk/CCTech with no Subject: line
in the header: that results in un-linked, and thus un-clickable, entries in
the archive (which some of, like me, use to read the list),
Anyone need/want a couple of these? Someone has a group of 5 for sale on eBait
(#184317666245), and I want a couple, but not _5_. The seller didn't respond
to a request to split up the lot, so I'd like to go in with a couple of other
people on the. Any takers?
Noel
> From: Ethan Dicks
> what are these found in?
The "Spare Module Handbook" lists:
RH11-AB
TM11, TMA11
MX11-B
Does _anyone_ actually have an MX11? Any documentation would also be welcome;
all I've been able to find out about it is a listing for the addresses of
control registers.
> The "Spare Module Handbook" lists:
> ...
> MX11-B
I apparently can't read. Should be "MX15-B":
https://gunkies.org/wiki/MX15-B_Memory_Multiplexer
Noel
> From: Josh Dersch
> RL02 packs that have been degaussed.
Might as well hammer nails through them. "To keep the heads properly aligned
on the tracks, it used a servo system driven by servo data written on the pack
(along with sector headers) at the factory. Packs cannnot be low-level
> I can't pick up in ON, unfortunately, but if someone who is in the area
> could please pick up this "Microprocessor Data Package" and ship it to
> me, I'd be willing to pay anything reasonable, or maybe slightly
> unreasonable.
You probably know this already, but if you're
> From: Chuck Guzis
> Perhaps my mistake with 22Disk was not putting a line in that said "Me
> fecit Carolus Guzis Anno MCMLXXXVII" or some such.
Love the Michaelangelo reference. I'm curious as to how many others on the
list got it. (It's carved into the strap on the Pieta.
> From: Chris Zach
> The last board is a new style 11/24 and it doesn't do anything but it
> does have three switch packs. So I just need to find the manual for it
Appendix D in the 003 rev of the /24 TM has the details of the -YA..
> In the meantime the UNIBUS problem also
> From: Chris Zach
> Unibus can get annoyed at a lot of things .. Q-Bus is much simpler
Not sure I'd concur with that latter. In analog terms the UNIBUS and QBUS are
almost identical (which is why the same driver chips such as 8641's are used
with both), and at the digital level they
> From: Jay Jaeger
>> 2--M7134 KT24 Memory map
> M7891 UNIBUS Memory (256K, I think, presumably addressed for 0).
If that's all the memory you have, the KT24 isn't really doing anything
(well, monitoring power; holding boot PROM's; etc). Is your MS11-L configured
to be EUB memory,
> From: Chris Zach
> My guess is the H215 has two more core fields on it
I uploaded a (crappy - sigh) image of an H215 I have to here:
https://gunkies.org/wiki/File:H215-core-memory-board.jpg
and it's clearly not symmetrical, but does have a slightly bugger blank space
than yours. It
Anyone recognize this card:
https://www.ebay.com/itm/313323417718
I looked, and it doesn't seem to be any of those for a PDP-11. However, I
see the DRAM array is 12x4 chips, which makes me think it might be for a
PDP-8?
Noel
> From: Antonio Carlini
> It was (iirc) described in DEC STD 012 (the part numbering standard) ...
> I do have (or did have) a DEC STDs CD at one point, but my copy of that
> seems to be missing DEC STD 012. ... I've no idea why this one might be
> missing.
It looks like you
Here:
https://www.ebay.com/itm/284137678274
and:
https://gunkies.org/wiki/KL11_asynchronous_serial_line_interface
if you want to know what it is. The lot includes an M105 Address Selector and
an M782 Interrupt Control (which you'd need to actually use it); the price for
the group is quite
> From: Steven Malikoff
> Would that be part of this system at a Japanese computer museum? ...
> the 11/05 has 'Unichannel15' on it
Yes, the 3 bays in the center are a PDP-15. (The indicator panel at the top
of the center bay is the one for the PDP-15 CPU; you can see it here:
I finally got around to completing the processing of the scanned images of the
pages of the MM11-F manual and engineering drawings. A PDF is available here:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/dload/DEC-11-HMFA-D_MM11-F_Manual.pdf
So, DEC part numbers (xx-y-zz) have a system where the 'xx' says what
_kind_ of part it is; e.g. bootstrap PROMs are all 23-x-yy. I seem to
recall reading at some point something which listed all the xx- codes, and
what they meant - but now I can't find it. A Web search didn't turn it up,
This seller:
https://www.ebay.com/itm/303862645513
is _completely_ insane! ~$2400 for an RL11 board?
Noel
Did someone here buy these:
https://www.ebay.com/itm/265018225826
I was wondering if they'll be scanned.
Noel
> I have a feeling there are two shell designs for the 6 pin.
Like I said, I have a vague memory of another keying design (I think it used a
ridge running parallel to the direction of insertion), but I don't think it's
from any DEC gear. There is definitely yet _another_ keying design, with
> From: Tom Uban
> The part numbers are:
. A106239-ND, TE Connectivity AMP Connectors 1-171196-0, CONN PLUG 6POS
MATE-N-LOK NATRL
> A1427-ND, TE Connectivity AMP Connectors 1-480323-0, CONN PLUG 15 POS
MATE-N-LOK
> See attached picture
That didn't come through for people on
> I have posted it here:
Ooops, moved it; now here:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/dec_connectors.jpg
Noel
> Are the power connectors on the DEC PDP-11 backplanes (e.g. DD11-DF
> 15pin and 6pin) Molex or other?
> Are they still commonly available?
https://gunkies.org/wiki/DEC_power_distribution_connectors#Connectors
I'm not sure why I bothered to write all this stuff up; it was clearly a
> I may have gotten the wrong 6pin shell.
I have this very vague memory of some similar connector shell, but I have no
memory of what the difference is.
I just checked the shells I have here, and they definitely fit onto the power
harness on an -11/40; and the numbers on the Web page are
> From: Glen Slick
> The KDJ11-E 11/93 has PMI signals on the CD connectors, so you need a
> Q/CD backplane
I have this bit set that plugging a PMI card into a Q/Q slot will damage it?
(I think the issue is that some PMI pins are 12V on normal QBUS; too tired
to check tonight, I'll
> From: Tom Uban
> it has the early version M7261E Control Logic & Microprogram board and
> the later version M7260 Data Paths board
Ah, I'm glad someone found all that stuff I wrote up there useful. As always,
I _think_ I got it all transcribed correctly, but do be on the lookout
> From: Lars Brinkhoff
> Chris Zach wrote:
>> I'll drop by and see which CHAOSNet card it has.
> It may have been removed when we worked on getting ITS booted.
For a long time AI used a UNIBUS CHAOSNet card, plugged into an -11 connected
up to AI via the Rubin 10-11 interface.
> Is there a controller to attach an RS64 disk to a PDP-8? The only
> controller for the RS64 I can find is the UNIBUS RC11. Thanks.
I never saw any reply, so I gather the answer is 'no'. I looked through the
stuff on BitSavers for a bunch of other machines (IIRC, PDP-9 and PDP-12
and
So, I have images of two different pieces of DEC documentation for the H960
series of racks/cabinets (the H950 is the bare rack; the H960 is the rack
complete with various appurtenances such as side panel, stabilizer feet,
etc). I had a request for them, so I've put them online. They are:
> From: Barry M
> H960 120 lbs (not sure if this includes the side panels)
The H960 has a whole constellation of appurtenances which can add to the
weight: sides, back door, back mounting frame, top fan(s), floor screen,
stabilizer feet, etc, etc.
I happen to have an empty H960 (well,
> I had a look at my /45 ... and it seems to ... look just like those on
> Josh's. I'd really want to take pictures of mine .. so I can compare
> them directly, though, not depend on visual memory.
Yeah, mine (a late /55, actually) has the _exact_ same wires at Josh's.
So that's
> From: Fritz Mueller
> could I ask that you take some closeups around the Mate-n-Locks along
> the top? I'd be very interested to see the board traces and the details
> of the red bus wiring there.
I had a look at my /45 (a later KB11-D - although I think the backplanes for
the
Is there a controller to attach an RS64 disk to a PDP-8? The only controller
for the RS64I can find is the UNIBUS RC11. Thanks.
Noel
> From: Henk Gooijen
> I have the M8120 and 4 M8121 boards (32kW bipolar RAM). It is a bit
> weird, but in the 11/55 are also two G114 boards (4kW MOS RAM), IIRC.
G114s? Those are the sense/inhibit module from the MM11-U/MJ11. Did you
mean G401s?
If so, one guess as to what
> From: Eric Smith
> The KB11-B (original 11/70) and KB11-C (later 11/70) have essentially
> the same changes as from the KB11-A to KB11-D
Speaking of which, two of the boards that are different in the KB11-D, from
the -A, are _identical_ to boards in the KB11-C - the M8123 ROM & ROM
> Fron: Jon Elson
> The write all function is likely how you format a blank pack.
No, 'Format' is a separate bit in the CSR from 'Read/Write-All', and they do
different things.
The RK11 always re-writes the header word of each sector when it writes a
sector in normal operation; when
> the Unix V6 RK pack formatter ... sets _both_ 'Format' and
> 'Read/Write-All
Oooops; my bad; I mis-read the register description. It's setting 'Inhibit Bus
Address Increment' and 'Format', not 'Format' and 'Read/Write-All'. So ignore my
speculation about 'Read/Write-All' not getting the
> From: Ethan Dicks
> I do have a replica KM-11 set that I need to construct.
You'll need the RK11-C overlays (shown on pg 6-2 of the RK11-c Manual). (My set
of overlays from Guy with his KM11 replica included them; thanks Guy :-).
> From: Fritz Mueller
> The cables are
> From: Fritz Mueller
> In at least one case of attempting to recover a pac
BTW, your neat hack to do that only works on the RK11-C, and not the RK11-D:
the latter doesn't implement 'Read/Write-All'.
Noel
> I'm too burned out to look at the engineering drawings and get the part
> number to confirm; I'll do that 'soon'.
The BA11-K FMPS gives the male shell part numbers as 12-09350-06 and -15; the
DD11-C lists the female shell numbers as 12-09351-06 and -15. Those look like
they are DEC
> From: Al Kossow
> Dover was not an Interpress printer
Yeah, it used Press format. BTW, here:
http://ana-3.lcs.mit.edu/~jnc/tech/unix/s2/press.c
is the program from our V6 Unix machine to produce PRESS format files for the
MIT Dover. (.v was the format for the Varian printer, a poor
> From: Al Kossow
> I have to find my qbus rk11 card.
The RKV11-D is a set of 4 quad cards (3 of them the same as the RK11-D) and a
custom 4-slot backplane (different from the RK11-D's), along with another
dual QBUS card, connected via flat cables. It was apparently usually supplied
by
> From: Al Kossow
> it's a single-card controller made by Xylogics.
Ah; never heard of that. If you don't mind indulging my curiousity, how did it
connect to the drive (if it used RK05's, and not a Diablo, or something)?
Normal flat cables to a dual card (like the RKV11-D), or a
There's a PDP-8 (/E or /M) backplane (presumably OMNIBUS) on eBay:
https://www.ebay.com/itm/0-slot-Backplane-H1919-9216/402735040240
(The number is given incorrectly in the title; it's actually 'H9191'.)
Noel
> From: Guy Sotomayor
> the LOADALL instructions including all of it's warts (and its inability
> to switch back from protected mode)
Good to have that confirmed (for the 286; apparently it works in the 386).
> the other way to get back to real mode from protected mode is via a
> From: Paul Koning
> There's a good reason why the big disks on many DEC machines were Massbus
> devices until MSCP arrived. It's quite clear on Unibus PDP-11s, which
> needed Massbus both for speed and for a cleaner answer to more-than-18
> bit addressing.
I follow the
> From: Paul Koning
> Here is an outline (not all the details) of the hardware scan flow:
> ...
> 2. Make sure the MMU exist; if not, halt.
> ...
> If it has FIS, it can only be an 11/40.
You probably know this already, but the KEV1-A floating point chip for
the LSI-11
> From: John Floren
> Can anyone on the list point me to either an existing archive where
> these exist
The canonical repository for historic documentation online is BitSavers.
It has an almost-complete set of DEC stuff (both manuals and prints. QBUS
devices are at:
> From: Jim Stephens
> The 286 can exit protected mode with the LOADALL instruction.
Really? So why all the hullabaloo about Triple Faults:
http://www.rcollins.org/Productivity/TripleFault.html
back in the day; and why did IBM set up the keyboard controller so it could
send a RESET
> From: Chris Zach
> technically the MASSBUS cable is just an extension of the Unibus
No.
For one thing, the MASSBUS has no lines for carrying memory addresses. So
there is no way to even build a box that 'translates' MASSBUS to UNIBUS; the
semantics ('the things you can say',
> From: Steven Malikoff
> I have yet to machine the bolt head tapers to the originals but lost
> the photo of one that was posted here some time ago.
By "bolt head tapers", do you mean the special bolts with countersunk heads,
or the countersunk holes in the extension feet? Whichever
This item:
https://www.ebay.com/itm/383837694443
(described as just an "EIA distribution panel" in the listing) turns out to be
a DZ11 distribution panel, if anyone needs/wants one. The price is vaguely
reasonable, but maybe the seller would accept a lower offer.
Noel
> From: Ethan Dicks
> One of these?
> ..
> Looks neat.
Wow; that's pretty impressive! Not only will it talk to an RK05, it also
works with drives from Ampex, Control Data, Diable, Pertec, etc, etc. I
didn't realize they were all similar enough (in terms to the controller
> From: Jerry Weiss
> I always wondered why the RKV11-D was only 16 bit addressable.
The manual (EK-RKV11-OP-001) says: "Since the 11/03 BUS structure has no
provision for extended addressing, no connection is made to the bus from
these [XM] bits on the RKVII-D." (pg. 3-5).
> The
> From: William Donzelli
> Sellers of collectibles and antiques get bombarded with nitpicks and
> corrections. Often these are right, but often they are wrong.
Yeah, that's why I didn't just assert 'this is wrong, X is right', but I gave
them the things to look at so they could
> From: Fritz Mueller
> I'm reassembling an PDP-11/34 in a BA11-K chassis right now, and am a
> little puzzled by the front mounting brackets (the ones that hold a
> KY11-L of either sort on the bottom, and a half trim-panel on the top).
> In particular, on the bottom half,
I'm slightly amazed at how some eBay sellers react. Take this item:
https://www.ebay.com/itm/154404969351
which the seller had listed as a 'PDP-8 PC05'. I sent the person a message
pointing out that it was a PC04 (as shown by the 4 rocker switches, and the
small backplane - PC05's have a
>> From: Fritz Mueller
>> my brackets just have a punched oval hole at the bottom, and not a
>> "tapped hole" per your description above.
> The adapters on mine look _almost_ identical to yours, but _definitly_
> have a #8 press fit threaded bushing at the bottom.
Now that
> From: From: Fritz Mueller
> two solutions come to mind -- the one you mention here with nut and
> washer, or inserting a hex-head machine screw in the other direction.
> Either the nut or the hex-head screw could then be secured with a small
> combination wrench.
Well, if
> From: Fritz Mueller
> Pictures of my brackets should be viewable at
> https://photos.app.goo.gl/wni3mDAQHozK9Ho27
I couldn't get them to display on my modern Window laptop, using either the
Edge or Explorer browsers. I had to get my wife to show them to me on her
Apple laptop. Not
> From: Lars Brinkhoff
> Anyone ever heard of the Systems Concepts SC-4 computer?
Given the SF address, and Peter Samson's signature, this is the _the_ Systems
Concepts. Never heard of the SC-4, though.
One oddity: the cover letter is dated 1972, but it talks of "the main G.E.
> From: Lars Brinkhoff
> I suppose that main computer could be the GE-645 on which Multics was
> developed? And they would still refer to it as G.E.
Oh, it was clearly referring to the Multics machine. I assumed that with the
GE sale being 1970, by '72 it was not a GE machine
> From: Bill Degnan
> Was there a UNIBUS storage system that used a cassette player as the
> storage device .., rigged to send receive signals via a serial card
> connection.
Yes and no. There is the TA11 Magnetic Tape Cassette System, which used the
TU60 Dual DECasette
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