05:40 PM, Brian Walenz via cctech wrote:
> > I'm assembling a PDP-8/a from a pile of parts, but I'm missing the entire
> > AC power entry assembly, as shown in
> > http://www.retrotechnology.com/restore/8a_trans_gnd0.jpg. Does anyone
> know
> > what the 6-pin c
I'm assembling a PDP-8/a from a pile of parts, but I'm missing the entire
AC power entry assembly, as shown in
http://www.retrotechnology.com/restore/8a_trans_gnd0.jpg. Does anyone know
what the 6-pin connector is? Even better, does anyone have an extra
assembly?
Thanks to Herb Johnson for the 8
On Wed, Aug 23, 2017 at 8:59 PM, Al Kossow via cctalk wrote:
>
> "Nathan Ensmenger has observed"
>
> he's written a whole book on the subject "The Computer Boys Take Over"
> https://mitpress.mit.edu/books/computer-boys-take-over
>
>
And:
"Recording Gender", Janet Abbate (also mentioned in the ar
On Mon, Jan 16, 2017 at 12:35 PM, Jon Elson wrote:
> [...]
a pump makes it work 10X better. The trick, as described in the Pace
> manuals, is you heat the connection for several seconds, then apply vacuum
> and orbit the tip so it moves the component pin in the plated through
> hole. That orbi
I've got one in the metal case. On the back is a property tag:
Teledyne Ryan Aeronautical
E.T. "028400a" [<- the 'a' in pen]
Gov't I.D. "MDA9729530013"
Prop. of "USAF"
R-5051-2-REV.5-93
Where the stuff in quotes is from a typewriter, the rest is form
boilerplate. There are also some inventory
On Mon, Nov 7, 2016 at 11:44 AM, Ian S. King wrote:
> I love reading stories of component-level repair.
>
Assuming my notes and sketchy memory make any sense:
One of my PDP 8a CPU boards (the M8315) passed all the self tests I could
toggle in, EXCEPT, it would ignore HLT instructions. It'd jus
On Tue, Aug 2, 2016 at 8:20 PM, Bob Vines wrote:
> Does anyone have DEC's PDP-8 _Introduction_to_Programming_, Editions 3
> and/or 4 and/or the PDP-8 _Programming_Languages_ handbooks?
>
> If you're not willing to part with your copy, could you scan the front
> covers of these handbooks and tell
On Sun, Jul 24, 2016 at 5:01 AM, Mattis Lind wrote:
> After successfully repairing the G231 module of the MM11-L set I continued
> with the next one. This one was not able to access addresses ending 0100
> (binary). Luckily it was not the transistors arrays that were bad but the
> selector chip.
It's not as old as some would like, but it's definitely unique enough.
http://www.ebay.com/itm/UBER-RARE-MULTIFLOW-TRACE-14-300-COMPILER-VINTAGE-COMPUTER-processor-compiler-/112050410557?hash=item1a16b9943d:g:r2EAAOSw3YNXbtaY
b
On Wed, Jun 22, 2016 at 12:01 PM, Noel Chiappa
wrote:
Werner Buchholz (editor), "Planning a Computer System: Project Stretch",
> McGraw-Hill, New York, 1962
>
http://ed-thelen.org/comp-hist/IBM-7030-Planning-McJones.pdf
> Speaking of books, there's also a CDC 6600 book:
>
> Jim E.
I have a printer - just finished putting a Rostock V2 together a week or so
ago - and an 87xm (and 86b, fwiw) and some modules, but no PRM-85. If fit
against a standard module board is sufficient, I can do an iteration or
two. I haven't quite finished calibration, but it is printing sufficiently
Is there an electronic copy of this floating around? My (ex-library) copy
is missing all of chapter 11, "What is there to calculate?. (And the last
page of the previous chapter). The pages weren't ripped out, they were
missing when it was bound. Very annoying, I enjoyed the book right up
until
I did a bit of searching in the fall for an 8881 (to fix a busted HALT
instruction on a PDP8a). I concluded the 7439 is a pin-for-pin replacement
- I can't claim all credit for this, it's probably known by a few people
here. My notes say the 8881 will handle 30mA loads. The 7401 will handle
16mA
On Sun, Mar 6, 2016 at 5:06 PM, Don North wrote:
> From the SIMH pdp11 RX driver (pdp11_rx.c) the disk size is computed as
> follows,
> and the byte offset into the file is computed by CALC_DA(trk,sec) given
> the PHYSICAL
> track (0..76) and sector (1..26) addresses used in accessing the
> cont
On Sun, Mar 6, 2016 at 3:33 PM, Mattis Lind wrote:
>
> Did you have problems with my RAW files as well? Which? I tested a few of
> them right now and they seemed to work fine.
>
Nope, no problems. That was what triggered this...that someone else could
do it.
I jury rigged an RX50, and managed
How the heck do you copy an RX02 disk for use in simh?
I've been trying to transfer RX02 images between simh and a real PDP11
(that has only two RX02's, console, and ethernet). So far, I've only
attempted sending an RX02 image from the PDP to simh, but simh fails to
read it: "?DIR-F-Invalid direc
Having read all sorts of bad things about these older oil filled
capacitors, I decided to replace the one on my 8a. I got what I think is a
replacement - 6 microF, 660VAC, 50/60Hz, "NO PCB's" - but it is physically
about 1/3 the size as the original.
Did the tech for these get that much better?
Don't forget about this one:
http://www.ebay.com/itm/191698368565
$17k for a CRT and a keyboard in a (beat up) wood case. He's missing the
box with the electronics, and, clearly, the cables... At least it isn't
signed!
b
On Sat, Sep 26, 2015 at 9:49 AM, wrote:
> Pocket change compared to w
On Tue, Sep 22, 2015 at 9:29 PM, Paul Anderson wrote:
What is the part number of the dead power supply you gave up on?
>
It's the H7864 (Astec aa12130) in the BA23 enclosure.
It powered up a few times, but now only the switch light comes on. If I
remember, it wouldn't power up with just the cp
Hi. The original ROM request showed up just before I started receiving
messages this morning, and I only got the tail end of the chatter. Instead
of tacking a reply on to that, I thought I'd just start a new thread and
introduce myself at the same time.
Here's what I think is 23-038e4-00 from an
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