test-drb February 2010

test-drb@ccmp.vtda.org

175 participants
221 discussions

seeking DEC digital mps - microprocessor series monitor/control panel

by nigel.d.williams＠gmail.com

http://www.dvq.com/oldcomp/photos2/1k/dec_micro_panel.JPG I find this device quite fascinating (Intel 8008 plugged into a PDP-8 host), if anyone has one surplus I would be interested in negotiating. thanks. www.retroComputingTasmania.com

13 years, 5 months

GNT 3601 tape punch docs?

by chrise＠pobox.com

Probably a stretch but wondering if anyone has any info (manual, pinouts, service documentation) for a GNT model 3601 8-bit (1") paper tape punch. It was probably better known in the CNC / automated machining world than in computing but my hope is to resurrect it as a backup punch for copying tapes I use with my ASR-33 and thereby save wear on the -33's punch. The unit has serial and parallel interfaces on DB25 connectors but I do not have any pinout information for those. The serial one I can probably figure out. Unfortunately, the unit is a little more sick than "works OK" seemed to imply from the eBay seller. It has what I believe to be a power supply problem because as soon as you try to punch all eight holes with the front panel test button, the power LED dims and the punch jams, apparently from lack of umph to complete the mission. It could also be jamming to start with and that causes the power drop I suppose. In any case, looking for any docs before I open it up and start digging around. I have written to GNT without a reply so far. Chris -- Chris Elmquist mailto:chrise at pobox.com

13 years, 7 months

Apple Lisa 1 for sale

by sellam＠vintagetech.com

I have an Apple Lisa 1 for sale. Yes, it has the Twiggy drives. It includes the Twiggy systems OS disks (2), original Lisa 1 manual, keyboard, original Lisa (rectangular button) mouse. It works. Excellent condition. Normally I would not so brazenly hawk something but I need to raise funds for an imminent move of the VCF archives. I'm entertaining any and all offers. At a minimum, there should be three zeroes before the decimal point. Please contact me directly if you're interested. Photos and more detail will be forwarded upon request. Will ship galaxy-wide. Thanks! -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

13 years, 7 months

Reading NorthStar Horizon hard sector disks on PC

by marvin＠west.net

> From: "Chuck Guzis" <cclist at sydex.com> > Not all Northstar diskettes are HS. One of the models (Advantage?) > isn't--and it's that format that the Microsolutions MatchPoint will > read, not the others. It's been too long since I've seen the darned > things... I think the machine you are thinking of might be the N* Dimension. The Advantage still uses 10-sector floppies. I've never seen the Dimension but vintagemicros on Ebay was selling one a while back and had a picture of it. Apparently it was MS-DOS compatible.

13 years, 9 months

Looking for CMD CQD-200/TM or CQD-200/M EPROM images

by glen.slick＠gmail.com

Does anyone have a CMD CQD-200/TM or CQD-200/M and an EPROM programmer or other means of reading the EPROM images that could send me a copy? I think I have mostly figured out the CSR decode PAL for a CQD-200/T and programmed a new one and now it responds to both the disk and tape CSRs, but only the tape CSR looks like it has normal values. Maybe I also need to replace the EPROMs with CQD-200/TM or CQD-200/M EPROM images to get it to respond normally to the disk CSR. I have had encouraging results so far doing the same to convert a CQD-220/M into a CQD-220/TM and got it working with both a disk and a tape at the same time. -Glen

13 years, 11 months

VMware appliances

by jfoust＠threedee.com

I was curious to see if anyone mentioned VMware as an emulation environment on this list. The archives show a brief conversation about it in 2002 regarding whether it could run OS/2. I've been using it for a client's servers for the past few months and it is mind-blowing. Drag-and-drop, super-fast start and stop of entire virtual servers. One of VMware's demo appliances is a DOS environment running old games. Linux large and small is a common OS in appliances, too. With the free VMware Workstation version, you can easily click-click and be running a downloaded appliance. So why aren't we using VMware appliance images to exchange pre-made, pre-set environments for running emulated OSes? - John

13 years, 11 months

HP-IB, Amigo/cs80, again, connectors

by emu＠e-bbes.com

OK, another question : a cheap source for the hp-ib, gpib connectors ? What I found so far is in the $ 20 range. (through hole, right angle, receptacle, ...) Cheers & Thanks

14 years

I'm,looking for PDP-11 CPU tests

by brain＠jbrain.com

I sent the DEC ROM info to the VT220 Font author, and he responded with thanks and also wanted to know if anyone had PDP-11 CPU tests. I noted he might want to join here, but I thought I'd start the ball rolling on his request. Jim -- Jim Brain, Brain Innovations (X) brain at jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Home: http://www.jbrain.com

14 years

Old DEC Power Control 861C

by icipasla＠gmail.com

*Many thanks, I found a leaking capacitor just as you have described. I've ordered new ones and will soon be able to replace it. I'll let you know if that fixes the problem (It should!).** Normand *>* Old DEC Power Control 861C Hi, *>* *>* looks like I am not getting the posting in my e-mail but my messages do get *>* posted. * This issue came up a few months back. Apparently gmail filters the replies to your own messages somewhere (and not to somewhere sensible!). Perhaps somebody else can rememebr the details. >* *>* I found this replyto my previous message by Tony Duell *>* <cctalk%40classiccmp.org?Subject=Re%3A%20Old%20DEC%20Power%20Control%20861C&In-Reply-To=%3Cm1NM4jS-000J3uC%40p850ug1%3E>in *>* the archives. *>* *>* To follow-up, the 861C emits a crackling noise for the first few seconds (20 *>* or so) and then I can hear a relay chattering (very noisy!). *>* *>* Also the light on the front panel is flashing continuously (maybe that's *>* normal.) * old DEC neons tend to flicker randomly (and it's truely random). The basic design is for the mains : Mains in--->filter --->Breaker-+--->Unswitched outs | +--->Contactor (big relay)-> Switched outs The contactor is controlled (in the 861) by a reed relay on the little PCB inside. This has a differentially-wound coil to give the 'ground for on' and 'ground for off' functionality on the 3 pin connector. The reed relay coil is powered by a little transformer/rectifier/capacitor circuit, mostly on the PCB. My first suspicioun is that capacitor. Open it up and look for any electrolytics on the PCB inside. -tony

14 years, 1 month

Soldering (Was: Re: HP-IB, Amigo/cs80 ... )

by trag＠io.com

> > Date: Thu, 18 Feb 2010 13:07:58 -0700 > From: Ben <bfranchuk at jetnet.ab.ca> > Chuck Guzis wrote: > >> Soldering now is far safer than it used to be. I can still recall >> the glorious sensation of picking up an American Beauty 100W >> soldering iron by the wrong end. >> >> I suppose that we should be thankful that we don't use an >> oxyacetylene torch for PCB work... > > I guess that is why BYTE[1] went from a hardware magazine > to software. Some of the best advice I got in college was from an EE professor who told us, "If you drop your soldering iron, don't try to catch it on the way down. Just let it go." Jeff Walther

14 years, 1 month

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test-drb February 2010