test-drb February 2014

test-drb@ccmp.vtda.org

191 participants
208 discussions

by elson＠pico-systems.com

The RICM needs to repair a S603 triple pulse amplifier flip-chip. The failed diode is listed as a DEC D-664. The DEC enthusiast cross-reference lists show it as a 1N3606. These diodes are nearly impossible to find. Can someone recommend a substitution for the 1N3606 diode? The 1N3606 is a Silicon diode (that's lucky, Germanium diodes are probably hard to find, now). 75 V reverse, 50 uA reverse leakage, 100 mA forward current. Unfortunately, my old book doesn't have much more info than that. But, I doubt you could go wrong with a 1N914 or 1N4148 signal diode. Any silicon switching diode will almost certainly work fine. Jon

10 years, 10 months

[u-u] Someone's looking for old software

by toby＠telegraphics.com.au

On 11/02/14 10:13 AM, arocker at Vex.Net wrote: > >>From LinkedIn's "Vintage Computers" group, the relevant bits: > > "I?m looking for some old software and license's for a VAX 3100 and VAX 4000 > > I?m looking for the Operating System called ?VAXELN? > > License part number is QL-375AB-AA OR QL-375A*.** either will work > > The software is QT-375AA-**" > > If somebody on the list has a dusty specimen of "VAXLN", whatever that is, > I'll forward the link. These are two mailing lists that can certainly help, so I'll forward this message to both. --Toby > > _______________________________________________ > u-u mailing list > u-u at unixunanimous.org > https://unixunanimous.org/mailman/listinfo/u-u >

10 years, 10 months

Need help with OS/8 + TC08

by cramcram＠gmail.com

Hi, I've finally got my TC08/TU56 passing the maindec diags now. I've also tried to copy some TC08 bootable tape images to my drives. I can write them, read them back and do a diff with no errors using resttc08/dumptc08. However when I try to boot using one of these tapes several blocks are read in and then the system crashes and burns with no console output. As an experiment I'd like to see if I could format/read/write files from OS/8 running on my RK05 but it seems like all the images I've looked at are configured for a TD8E and don't have the TC08 driver on disk. I'm not an OS/8 expert but I tried a build and when I typed (I'm going from memory here): IN TC08,DTA0 ...I got a message like "HANDLER NOT FOUND" (or something to that effect). Looking at the disk didn't reveal any TC08 drivers. The PRINT command did show that it had been configured previously for TD8E support. So how can I get the TC08 handler onto my RK05? Could I PIP this from the serial connection somehow? Also, what is the correct way to do a build with TC08 support? Any thoughts/insight appreciated. Thanks, Marc

10 years, 10 months

DEC VT101

by aswood＠t-online.de

Hello all, I'm looking for DEC vt101 schematics and maintenance manual. I've a vt101. The power supply and logic board is ok. All power levels and video signals are supplied to the video board properly, but there is no dispay on the crt and I'm suspecting that the video board is defective. Andreas

10 years, 10 months

Need DEC Diode Substitution

by michael.99.thompson＠gmail.com

10 years, 10 months

Could someone make me some 400k System 2 and/or 3 disks?

by arrowrunner＠gmail.com

I just picked up two original Macintosh 128k systems. I don't yet have the capability of making these disks, so if anyone here does I'd give you a few bucks for your time. I'd like to get the OS disk and the utilities like paint and whatnot. I'm in the US by the way. Thanks -- Sent from my time machine

10 years, 10 months

OS/8 Disk Server with simh

by kylevowen＠gmail.com

Greetings, Does anyone have any tips on connecting an application like my disk server (which ordinarily talks to a serial port) to an auxiliary teletype on simh? I'd love to be able to easily debug my handler and such with breakpoints, memory inspection, etc. Or, if someone wants to tackle this with the provided code, that'd be awesome. https://github.com/drovak/os8diskserver I'm trying to figure out why running most any BASIC program in OS/8 results in a halt at 10206. In other news, I successfully FOTP'ed an entire RK05 side to another disk all with the disk server. Seemed to finish with no errors. Unfortunately, at 19200 baud, it took many minutes to complete. Thanks, Kyle

10 years, 10 months

Stardent Titan on eBay

by seefriek＠gmail.com

http://www.ebay.com/itm/Extremely-Rare-Vintage-Computer-Stardent-Computer-I… I'd hazard a guess you could count the number of complete Titans on a hand or two.

10 years, 10 months

DEC VT101

by marvin＠west.net

> I measured the resistance of the flyback transformer as of four > Ohms. From my point of view this is a proper value. > > Andreas Just curious for the reason you think a resistance measurement will show up a shorted turn(s) in the flyback? Marvin

10 years, 10 months

Vintage keycaps

by brad＠bettercomputing.net

Thanks Mike. ?I've tried a few searches for the keypunch keys but no luck. ?I don't have the actual article for the keyboard.. just the TV Typewriter, which features the same keyboard on the cover but not the greatrst quality. ?I am relying on Matt Holley's little archive. ?Here is a link to a black and white of it. ?Keys are light grey. http://www.swtpc.com/mholley/RadioElectronics/Feb1973/RE_Feb_1973_pg55.jpg Sent from Samsung Mobile <div>-------- Original message --------</div><div>From: MikeS <dm561 at torfree.net> </div><div>Date:02/10/2014 12:00 PM (GMT-08:00) </div><div>To: cctalk at classiccmp.org </div><div>Subject: Re: Vintage keycaps </div><div> </div>----- Original Message ----- > Date: Sun, 09 Feb 2014 10:50:57 -0800 > From: Brad Hodge <brad at bettercomputing.net> > One other question.. for my TV Typewriter project I am hoping to ape > either of the two keyboard designs featured in the magazine.. either the > blue/red keypunch/teletype style keys of the prototype or the custom keys > with keycaps featured in the Feb 1973 issue. Wondering if anyone knows of > possible sources for these. ?I think part of my problem is when searching > ebay i may not have exactly the right words or phrase.. ie. Not sure if > 'keypunch' is the right term for the keys used in the prototype. I'm > hoping to make this as close to one of the two featured designs as > possible so it's important to get the keys right. > > Thanks muchly, > > Brad I can't make out the 'normal' keyboard and my issue of September 1973 RE is mysteriously missing, but I believe the black, red and blue keyboard is from an MDS key-to-tape unit. I bought a bunch of those surplus back in the day because the switches were MicroSwitch magnet/reed switches, ideal for the harsh oil-filled environment of an industrial data-collection terminal I was building and selling at the time. I thought I still had one or two but if I do I can't find them in Chaos Cellar; will let you know if I do find anything. If you send me a close-up of the other keyboard I might have something that would be equivalent; I still have boxes of different keytops from the above-mentioned project. m

10 years, 10 months

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test-drb February 2014