test-drb

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101090 discussions

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

11 years, 5 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

11 years, 5 months

Need DEC Diode Substitution

by michael.99.thompson＠gmail.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? -- Michael Thompson

11 years, 5 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

11 years, 5 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

11 years, 5 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.

11 years, 5 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

11 years, 5 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

11 years, 5 months

Need DEC Diode Substitution

by steve＠tronola.com

Hi Michael At 07:49 AM 2/11/2014, you wrote: >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? >Michael Thompson --- The DEC schematic for the S603 does indeed list 1N3606 as equivalent to the D664. I found complete info on the 1N3606 in the GE 1964 Transistor Manual pp.439-446, pp.564-565, p.587. It does have some special processing, including gold doping and controlled forward characteristics. A couple parameters which stood out are: - Reverse recovery time: 2ns (nanoseconds--some sources show microseconds, woof) - Forward voltage 0.55Vmax at 0.1mA, 0.67Vmax at 1mA. Note that some of the online data listed for this part is misleading or wrong. Though lesser diodes would probably work, no doubt you would prefer to replace it with one at least as good, for the sake of preserving the integrity of the restoration. Anyway, I found that the 1N3606 is claimed to be available: Qty-61 shown here. Price is $1.54ea: http://www.ralphselectronics.com/SearchResults.aspx?criteria=1N3606 This source shows Qty-173 in Irvine, CA: http://partsearch.area51esg.com/icswdl2.aspx?user=area51&user=area51&part=1… New Jersey Semiconductor claims Qty-1424: http://njsemi.com/product-request/ There were other sources, if those don't pan out. Steve L.

11 years, 5 months

VAXStation II/MFM emulator

by djg＠pdp8online.com

So far not going well. Didn't seem to have any video from the video board so pulled that which gives me a serial console. Trying to boot from my emulator gives 4C DEVINACT. If I'm on the correct drive select I get the error quicker so its seeing the emulator. TK50 is just blinking red so I can't boot the diag tape. Online seems to say a good cleaning may fix this. Next tried to find the diagnostic floppies. Found these (uvax2diag1) which may be what I want. http://www.headcrashers.org/comp/rx50/index.html Get same 4C DEVINACT trying to boot them. Page didn't give PUTR command used to create images. I tried both with and without /binary. Does anyone know of known good diagnostic floppy images hopefully with information on how to write them back to a floppy? I assume the full diagnostic hasn't shown up so all that is available is the stripped down customer one. Also what is the name you give to boot for the hard drive, floppy, and tape? Manuals seem skimpy on details and this machine doesn't have the show command. Also I was assuming the bottom drive is the boot drive based on the manuals I have. Was this normal? I haven't tried putting the real drive back in and seeing if its bootable. Since I don't know the password I'll either have to hard shut it down if it boots or try one of the procedures for resetting the password. Looks like it is VMS.

11 years, 5 months

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