test-drb August 2015

test-drb@ccmp.vtda.org

206 participants
257 discussions

by mark.kahrs＠gmail.com

One could always implement a KDF9 emulator and then port Randall and Russell code (from the book). And r.e. ALGOL68, Peter Hibbard had some sort of ALGOL68 system working on the PDP11s at CMU I believe.

8 years, 9 months

Fwd: sparc20 available in boston

by paulkoning＠comcast.net

Posting this for another NetBSD developer. Please contact him directly if interested; I don?t have any additional information. paul > Begin forwarded message: > > From: David Holland <dholland-developers at netbsd.org> > Subject: sparc20 available in boston > Date: August 11, 2015 at 2:05:41 PM EDT > > I have a sparc20 sitting in my office that I need to get rid of for > space reasons. Anyone in Boston want it? I do not have time to deal > with shipping it, but you're welcome to try to persuade someone else > around here to do that :-) > > It has a keyboard and mouse, and I think a framebuffer, but no > monitor. There are I think two or three cpu modules, though I vaguely > recall there being an issue with one of them. Dunno how much RAM it > has. > > Deadline is Friday, although if someone speaks up by then I might be > able to hold it until the end of the month. Otherwise it gets thrown > out... > > -- > David A. Holland > dholland at netbsd.org

8 years, 9 months

Qbus split I&D?

by jnc＠mercury.lcs.mit.edu

> From: Johnny Billquist > The 11/34 that I played with did not have a product from Enable. ... > The product "my" 11/34 have came from Systime Thanks for chasing that down. Yes, that would explain the non-meshing memories! :-) > In addition, a few wires needs to be changed on the backplane, there is > a cable from a CPU card to the Systime card, and a few modifications > required on the 11/34 CPU itself. This all makes sense - if one can reach into the CPU, it's definitely plausible to have an upgrade which expands the size of the PARs (unlike the ENABLE board from Able). Noel

8 years, 9 months

And speaking of ALGOL

by jnc＠mercury.lcs.mit.edu

> From: Chuck Guzis > Why all this DEC stuff about Algol? I probably started it; I just mentioned the PDP-11 one because a lot of people already have either 11's, or an emulator up and running. Noel

8 years, 9 months

OT: Slow booting, was re: Booting an IBM MP 3000 S/390 System

by jnc＠mercury.lcs.mit.edu

> From: Chuck Guzis > Could it be that the presence of ECC registered SDRAM requires that > every memory location get written before boot-up can proceed? There's > 2GB of the stuff, so that could be the difference. I was going to suggest that, actually. Turning on ECC in the memory in a somewhat older HP minitower machine caused a long delay in booting while it cleared all the memory. Noel

8 years, 9 months

DEC RX02-PA?

by ben＠bensinclair.com

I found this on eBay, and I'm not sure what it is: http://www.ebay.com/itm/VINTAGE-DIGITAL-RX02-COMPUTER-SYSTEM-2-FLOPPY-DRIVE… I haven't seen RX-02s in a case like this before, and some Googling doesn't seem to reveal much of anything. Does anyone know what this is exactly? Thanks! -- Ben Sinclair ben at bensinclair.com

8 years, 9 months

SCSI Tape to TAP utility

by marc.verdiell＠gmail.com

Thanks Jay! Marc ---------------------------- From: Jay Jaeger <cube1 at charter.net> The link below is to a Google Drive folder with three files that I will leave up for a while: awstape.c - Read a SCSI tape, output in AWS format (Linux) awstoraw.c - Read an AWS file, output a raw byte stream awstosimh.c - Read an AWS file, output a SimH https://drive.google.com/folderview?id=0B2v4WRwISEQRfi1TWnlKU1hqUXphWVhpZ1FK OGFoVjRPVnppX1F2aUMwTUw0QkxSNEsyMjg&usp=sharing They are anything but elegant, but have gotten the job done for me. JRU --------------------------

8 years, 9 months

Friendly reminder to any 5620 / BLIT owners...

by ian.finder＠gmail.com

The battery in the teletype DMD 5620 is mounted in a very fatal position, and does indeed leak, as I learned this weekend. If you have not removed it, I would get on that now. In fact, if you still have batteries in anything, you might be doing it wrong... ;) Cheers, - Ian -- Ian Finder (206) 395-MIPS ian.finder at gmail.com

8 years, 9 months

SCSI Tape to TAP utility

by marc.verdiell＠gmail.com

Hey, I'll take the offer, I am interested in both. Marc > Jay Jaeger wrote: > If anyone is interested, I have code for a Linux SCSI tape to > AWSTAPE program, and a program that translates aws format to a raw > byte stream. Not sure if I have one that translates to the SimH .tap > format, though. GNU C. > Chuck Guzis wrote: > I've got a Linux utility to translate SIMH .tap to raw binary, if that's > interesting to anyone. I would have thought that such utilities existed > already.

8 years, 9 months

PDP-12 Restoration at the RICM

by michael.99.thompson＠gmail.com

We found a shorted diode in one of the rectifiers in the +/-42VDC supply in the VR14 that was causing the main fuse to blow. The donor of the PDP-12 gave us a spare so that was an easy fix. We reinstalled the VR14 in the PDP-12 and ran the display diags. The VR14 display actually works! We found a open trimpot for the gain on the vertical flip-chip. We swapped the horizontal and vertical flip-chips, adjusted the gain trimpot, removed the flip-chip, and added a fixed resistor with the same value for now. The display when running the diags looks very nice and crisp. We booted LAP6-DIAL and could display a listing of the files on the tape on the VR14 monitor. After about 20 minutes of running nicely, the TC12 went back into the mode where it could not find blocks. Oh well, more debugging to do. -- Michael Thompson

8 years, 9 months

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test-drb August 2015