test-drb

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101090 discussions

by jnc＠mercury.lcs.mit.edu

> From: Richard Loken > I have an Ann Arbor Ambassador here with the original owner's manual. If anyone else has _another_ AAA, I'd like one too! (I'm assuming Ian's going to be getting this one! :-) They were wonderful terminals, in their day - the largest screen of any terminal easily available at the time. People in Tech Sq preferred them to VT*, etc for that reason. Noel

10 years, 1 month

options for replacing failed small ROMs in PDP-11

by jnc＠mercury.lcs.mit.edu

> From: Glen Slick > the part is listed as DM8598-AD, where a DM8598 is a 256-bit (32x8) > tri-state bipolar mask ROM. > Some substitute T.S. PROMs include the Signetics 82S123 On my M8101, it's an 82S123, which is a tri-state programmable PROM (the 82S23 is the open-collector version of that chip). Those should be relatively easy to obtain. BTW, quick question: if a fusible link PROM 'fails' because one of the fusible links regrows, is it possible to 're-program' that particular chip, back to the 'original contents'? Some programmers might barf (because they want the chip to be 'empty' to start with'), but maybe one of those home-brew pgrogrammers could 'refresh' the chip (thereby avoiding using up a new chip, when it's not really needed)? > From: Curtis H. Wilbar Jr. > Is there a file containing the image ? I'd really like to accumulate a database of the contents of all the PROM components for all the PDP-11 CPU's. I've got a few of them (for the -11/05), but there are zillions more. Anytime anyone creates one, can you please send me a copy, and I'll try and get them organized and uploaded (and if I _really_ get ambitious, I might try and start filling in the gaps). Noel

10 years, 1 month

CDC 6600 - Why so awesome?

by jnc＠mercury.lcs.mit.edu

> From: Swift Griggs >> Much of the architectural concept was shared with IBM 7030 STRETCH >> (another system worth researching). > Hmm, I've never heard of it. I'll check it out. The first supercomputer, IMO. It's an interesting machine, with a variety of innovations that later became standard: e.g. it has separate instruction and arithmetic units, with the former being in charge of all fetches, both instruction and data, as well as executing things like branch instructions; it also has a primitive form of pipelining ("Interlocks in the look-ahead unit ensure that nothing is altered permanently until all the preceeding instructions have been executed successfully.") Eric has a nice page about it: https://www.brouhaha.com/~eric/retrocomputing/ibm/stretch/ There's a good book about it: Werner Buchholz (editor), "Planning a Computer System: Project Stretch", McGraw-Hill, New York, 1962 Speaking of books, there's also a CDC 6600 book: Jim E. Thornton, "Design of A Computer: The Control Data 6600", Scott, Foresman, Glenview, 1970 Really gotta do that Bibliography! Noel

10 years, 1 month

Grey Wall (VMS) available

by jwest＠classiccmp.org

Someone emailed me last night that has a full set (about 30+) of manuals in grey binders for VMS 5.0. Still waiting for them to respond with their location. This is not something I'd want... J

10 years, 1 month

Wanted: Ann Arbor Ambassador terminal

by ian.primus.ccmp＠gmail.com

It's been a long time since I've asked about this, so I figured it was worth another shot. I've been looking for an Ann Arbor Ambassador terminal for close to fifteen years, with no success. It's kind of an obscure model, but they did exist. I heard of one being available several years back, but, unfortunately, someone else got it before I could. So, does anyone have one of these? Has anyone seen one in recent memory? -Ian

10 years, 1 month

contemplating selling my VT52

by rescue＠hawkmountain.net

I've been saving the VT52 I've owned for years (used it with a modem back in the late 80s to dial into school) with the thought of paring it up with a PDP-8/E, PDP-8/F, or PDP-8/M .... but I don't know that the PDP-8 train will ever stop here. I've come close a couple of times, but have either missed the train on a good deal, or not been in a position to stomach the pricing some of them fetch. So, I'm contemplating selling the VT-52. It has age typical wear, but last time it was powered on, it was working. There was a touchy connection that would act up once in a while requiring a tap on the side to bring it back around (something in the video connection no doubt). I never dug into it to resolve it 100%, as it didn't happen often, and a 'love tap' on the right side always brought it around. I'd like to hang onto it, but it is big. I'm entertaining offers which might sway my decision to keep/sell it. I'm located close to the intersection of Sharon, Easton, and Stoughton, MA. I don't think shipping is an option, unless your willing to pay, and take the risk on something like this being transported. If I can get a big enough box, I can pack it well.... but I'd prefer not to do it due to the risks involved. Keep VT52 in the subject line of any e-mail you send so I can find it easier. Sometimes I may only check mail here once a week, so if you are inquiring and don't hear from me for a while, no fear, I'll get around to you. -- Curt

10 years, 1 month

Teletype on ebay

by dj.taylor4＠comcast.net

There is a Teletype printer on ebay, the seller is in Virginia. Ebay item 231990393069 The auction title is: 1966 - Vintage Antique TELETYPE INKTRONIC Receive Only Set TelePrinter Parallel

10 years, 1 month

KM11 uPB question

by fritzm＠fritzm.org

Hey folks, While working on my 11/45, I built up a KM11 replica based on Tom Uban's ExpressPCB layout. I noticed the following behavior when trying to use it in uPB mode on my KB11-A CPU: * If I set up uPB, set KM11 S1 on and S2 off, and resume execution, the breakpoint fails to stop the processor * BUT, if I depress and *hold* CONT, while it is held down the CPU will be held in T2 on the target microword * If I then reach over and flip on S2 before releasing CONT I can hold the machine there in T2 Documentation on the KM11 seems to imply that the machine should just stop at the target state holding in T2 without having to do the holding-down-CONT-while-flipping-on-S2 thing. I was wondering if this was an oddity of my KM11, my CPU, or is that just the way uPB mode works on these things? thanks, --FritzM.

10 years, 1 month

PDP-11/45 restoration running console emulator

by fritzm＠fritzm.org

Just wanted to share some joy here: after a months-long spare time restoration and debug process, the PDP-11/45 I've been working on booted to the M9301 console emulator last night (pic at http://fritzm.github.io/images/pdp11/m9301-running.jpg). Made me super happy to see that register dump an the "$" prompt :-) Next up will be using PDP11GUI to run more thorough diagnostics, then I'll be moving on to storage (RK05)... cheers, --FritzM.

10 years, 1 month

Force SPARC/CPU-5V-64-110-2 available.

by mattislind＠gmail.com

I have two Force VME boards with microSPARC CPU which I have no use for. SPARC/CPU-5V-64-110-2. 110 MHz. 64 Mbyte. https://imgur.com/a/4GWqB Trade for something interesting. /Mattis

10 years, 1 month

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