test-drb

test-drb@ccmp.vtda.org

101090 discussions

by cctalk＠snarc.net

VCF West XIII will be held August 4-5 at the Computer History Museum in Mountain View, California. Exhibit registration is open: http://vcfed.org/wp/festivals/vintage-computer-festival-west/vcf-west-exhib…. ________________________________ Evan Koblentz, director Vintage Computer Federation a 501(c)3 educational non-profit evan at vcfed.org (646) 546-9999 www.vcfed.org facebook.com/vcfederation twitter.com/vcfederation

8 years, 5 months

LSI11 CPU Microm

by dj.taylor4＠comcast.net

I was trying to put together a minimal PDP-11/03 using a quad width M7264 CPU and got nothing, no ODT prompt.? I'm not sure the board is working. Searching the internet I came across this page which described a M7264 CPU board with a 'bad' MICROM http://www.datormuseum.se/computers/digital-equipment-corporation/qbus Quoting the page; "Using a logic analyser showed that the MICROM without label is not behaving well." Anyone know how a logic analyser would be used to determine this?? Other hints to debug this board? Doug

8 years, 5 months

R.I.P. Robert T. "Doc" Suding

by spacewar＠gmail.com

I just learned from the April 2018 issue of QST that Robert T. "Doc" Suding, W0LMD, has died. Suding cofounded and was chief design engineer of The Digital Group, an early microcomputer company in Denver (1974-1979).

8 years, 5 months

Shipping a Flexowriter

by kylevowen＠gmail.com

Does anyone have any tips on preparing a Flexowriter for shipping? Any thoughts as to crate vs. pallet? Thanks, Kyle

8 years, 5 months

Somewhat random QBus backplane / chassis question

by derschjo＠gmail.com

Hi all -- I've got an 11/03 backplane here (designated as an "11/03 EA" originally but marked as "Model changed from EA to AA") inside a small chassis w/power supply, model "OH780-A."? (So it was at some point in its life the front-end to a VAX-11/780.)? As far as I can tell, it has a standard H9270 backplane (4-slot, quad width) in it. The chassis appears to work fine when I have an actual LSI-11 in there (I've been experimenting with an 11/23, but I do have an 11/03 boardset that works in it). What I want to do with the chassis is use it with a UNIBUS->QBus bridge I have, as a Qbus backplane for a SCSI controller (and maybe other things) for my VAX-11/750.? I have encountered an oddity in doing so, and I've looked at the documentation and I remain puzzled.? The oddity is this:? If I don't have an LSI-11 CPU board in place in the chassis, the power supply won't come up properly.? (The +5V appears to pulse, the kind of behavior I'd expect with a shorted or heavily loaded supply rail somewhere). Here's a basic rundown of what I've observed: - If I put an 11/23 or 11/03 CPU in, everything works fine. - Doesn't matter what slot the CPU's in either, as long as there's a CPU board somewhere in the thing, all's well. - Doesn't matter how heavily or lightly loaded the backplane is; I've tried it with just a QBus SCSI controller, I've tried it with the backplane stuffed full of boards. Since I want to use this as a simple QBus backplane, I don't want to have a CPU board in place.? I haven't seen this behavior before (but then, I can't recall trying to run a Qbus backplane without a CPU in it either).? I thought I knew QBus fairly well, so I assume I'm overlooking something obvious.? Or perhaps there is a fault here with the chassis, somehow.? I figure someone here will have the answer immediately and I'll slap my forehead... Thanks as always, Josh

8 years, 5 months

Remnants of local Commodore Users' Group being offered for free

by barythrin＠gmail.com

Whoever or whichever group does get it, i hope if they have any files or interesting info the rest of the clubs can help store. null

8 years, 5 months

R.I.P. Robert T. "Doc" Suding

by jnc＠mercury.lcs.mit.edu

> From: Al Kossow > The only place I ever saw an Apple I when it was for sale. Don't you wish you'd bought one - and kept it? :-) Noel

8 years, 5 months

Help with IC identification

by binarydinosaurs＠gmail.com

Hi folks, I'm looking for info on a few 8 pin DIPs that are in a cache battery module. They're marked thus: 4973 AK W79B 4965 AF W83A Anyone? I've not traced pinouts yet but maybe someone else's google-fu is better than mine today. Cheers, -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? t: @binarydinosaurs f: facebook.com/binarydinosaurs w: www.binarydinosaurs.co.uk

8 years, 5 months

DEC Field Guide > equivalent available for Data General?

by u.tagge＠gmx.de

Hi all, is there somewhere a list of DG modules which includes also 3rd party/OEM, ... like it is available for DEC? Would be good to know what the following is: 107-000621 02 107-000621 03/11 107-001632-00 107-0016320/02 107-000718-00 107-000181-04 107-000187-16 107-000187-15-30 AB020116-00 107-000621-03 107-001768-02 107-001768-03 107-0017680-1E 107-00053905 Zetaco SCZ-2 >500-453-00 K >500-542-00 K Many Greetings Ulrich

8 years, 5 months

Remnants of local Commodore Users' Group being offered for free

by cclist＠sydex.com

This is in Eugene, OR. I received the following email on the local Freecycle-type list: ---------------------------------------------------------------- I have all of the "Lane County Commodore Users Group" (LCCUG) inventory including (but not limited to) the following : Keyboards, one monitor, transformers, two disc players for 5 1/2 inch floppies, cassette tape player, games, a whole lot of instructions, dozens of empty discs, dozens of full discs, and much more. Plus a 25-plus pound lap top (SX-64) ! More than a regular car trunk can hold . Many items in original boxes. LCCUG is no longer exists. For a classic computer buff this would be a gold mine. It is amazing what this old computer was able to do - 30 years ago! 18th and Chambers area - Eugene. jimsav97405 at yahoo.com ------------------------------------------------------------------- I have nothing to do with this offer. FYI --Chuck

8 years, 5 months

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