test-drb

test-drb@ccmp.vtda.org

101090 discussions

by jws＠jwsss.com

A friend has a large set of paper tape which seems to be from a DG User group (not sure about that, but label on box sort of implies that). The tape pile is fanfold about 10" across in a DG box specially made for such use. We hope to have a reader to digitize it soon, but wonder if anyone knows of such a program? We just have the labels which say that is what the tape has to go on. More photos and the like later. I know that more info would be helpful, but figured I'd ask first. thanks Jim

10 years

Is there a C compiler for CP/M-80?

by applecorey＠optonline.net

I think the title explains it all. Looking for a C compiler I can run on my Sol-20 with CP/M 1.4 Thanks, Corey corey cohen u??o? ???o?

10 years

PDP-11

by dave.g4ugm＠gmail.com

Folks, I have recently a PDP-11 which apparently came from a VAX console. It looks to me like there are two CPU's in there, a console card, RX02 Controller, Memory and Bus Terminator. I have done lots of searching and there doesn't seem to be a simple list of what can run on it, assuming I can find some RX02 floppy disks to go with it.. Any pointers to documentation? Clues on how to arrange the cards in the box. Dave Wade

10 years

Manual for Remex RRJ8000 serial paper tape reader circa 1979?

by nw＠retrocomputingtasmania.com

If anyone knows the dip switch settings, I'd be grateful to learn them please or even better a manual. It doesn't match any of the units currently on bitsavers. Compared to the more common Remex units this one is quite compact. I tried some test tapes and it produces a regular pattern differing only in a couple of bits, I think it is indicating parity errors, I'm guessing one of the dip-switch settings controls parity.

10 years

VT101 screen adjustment

by witchy＠binarydinosaurs.co.uk

Hi folks, Picked up a couple of nice condition VT's today, a VT101 and VT131 though only one DEC keyboard. 2 other keyboards were included which look identical to DEC ones but have different keytops and obvious non-DEC cables though they have the 6mm jack plug on the end. Need to dig into those. Anyhoo, the VT101's screen is showing the stretch-at-top-compress-at-bottom issue, is that adjustable using the troubleshooting guide in the technical reference or am I looking at replacing some caps? I also get character set glitches and it either doesn't register key presses or registers too many, I know it's not the keyboard itself since I've tried my 'DECbox' VT102 keyboard and it does the same. Not looked at the 5V rail yet, that's a job for tomorrow... cheers, -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

10 years

Non-DEC keyboard lookalikes (was: VT1xx stuff)

by witchy＠binarydinosaurs.co.uk

Since I now have a couple of these and google is coming up blank-ish has anyone come across a VT keyboard, possibly from a Plessey PT100 style terminal, that is 99% VT100 in shape, colour and key layout? Even the 6mm jack plug though I know Apple used that too on the Lisa. I found a message thread from here in 2002 about the VT131 and what sounds like an identical keyboard but aside from 'don't knows' and a mention of Plessey nothing else was found and it descended into chat about scanning Microfiche. I toyed briefly with the thought that I'd ended up with the VT and keyboard of those messages but the OP of that was in Champagne IL. Earlier tonight I dismantled one of them in the hope of seeing a manufacturer or any sort of branding but nada. There's a 2716 EPROM marked 'PKB00' which I dumped but there's nothing of note in there either. Maybe the pic will help, maybe not since you'll think 'that's a VT keyboard' :) -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

10 years

Anyone Have a Working AlphaStation 200 to Run Some Tests For Me?

by robert.jarratt＠ntlworld.com

I can?t remember if I already asked, but I need to find a working example and ask it?s owner to run some tests on it for me to help me diagnose a fault on mine. Ideally the machine would be running VMS. Thanks Rob Sent from my Windows 10 phone

10 years

"Retro Repair" key electronics skills?

by elson＠pico-systems.com

On 05/10/2016 02:33 PM, Bill Sudbrink wrote: >> The other is that, as I said before, any ground >> connection has impedance (it's the inductance that >> is troublesome normally) so that points (say IC pins) >> that are shown as grounded may actually have a >> voltage difference between them. > If I think about it too much, this gives me the > willies, the same way. > > I have a 3500 Lb Sheldon lathe. During rebuilding of it, I got a very sensitive electronic level, to aid in making sure the bed was reground straight. I found that when I walked >from one end of the lathe to the other, it tilted about one arc second. That was my weight deflecting the concrete floor of my basement, causing the lathe to tilt slightly. All structures, including the earth, deflect under load. Jon

10 years

"Retro Repair" key electronics skills?

by swiftgriggs＠gmail.com

I figure I'm good for about eighty hours or so of reading and fooling around with electronics before I'll want to move onto a different hobby for a while (I rotate through a whole bunch). That's my normal MO. So, I'm wondering what kind of skills I could build with that time, once I get started. I'd love to hear if anyone has suggestions for how to use my time wisely to learn skills that would be most useful for working on older machines (mid 80's to late 90's is my focus as far as a hardware bandpass). Here's what I (think) I know now: - Basics about electricity. Ie.. Ohms law, power vs frequency, etc.. - I understand basic physics ("A" in 100-level college course and two years of high school physics, too). I actually had an excellent teacher, too! - I used to do math to about a 300-400 level, but now I'm at a 100-200 level (I can still do most algebra II, some trig, and a few other bits). - I understand what most analog components do (resistors, capacitors, diodes, etc..). I can run a volt-meter, and super-basic operations with an analog scope (checking test points and that kind of simple crap) . I also have a rudimentary rig for soldering etc... - Since I'm a coder, I understand boolean logic (which I hope would help with ICs). - I took a digital electronics course in college. However, it was pathetic and it's all gone now anyway. I've spent most of my technical energy learning coding and sysadmin skills, not hardware. I'm still interested in it, though. I'm most comfortable with self-teaching via projects. Any that you folks would recommend (even if they are for kids, I don't mind, I'm not proud) I'd love to hear about them. Books, project kits, etc.. My goal would be able to understand 40% of what is happening on an Amiga 500 or that level of machine. If I could do that.... wow. fun. cool. Plus I bet I could repair many more items/problems than I can today. -Swift

10 years

PDP-8 core memory board

by jnc＠mercury.lcs.mit.edu

FAYI: http://www.ebay.com/itm/262419353233 DEC H219a & G649 8K X 12 Core Memory Stack Noel

10 years

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