test-drb February 2012

test-drb@ccmp.vtda.org

158 participants
158 discussions

by hp-fix＠xs4all.nl

I have a HP 9845T (B with 2 tape drives and printer) for trade or sale. The unit is in a nice optical condition, except for a bit screen mold on the monitor and the ROM's are bad, not a real problem because I throw in 2 ROM-boards with the programmed flash IC's. The only thing you have to do is to build the rom boards and place them in the HP 9845B (I did tested it with the board of my own and it works). I tested the PSU and replaced the filter caps with new ones. This also includes a manual and some other papers. Trade for other HP-stuff preferably HP 9800 items (roms manuals interfaces etc.) But I will consider other options. Item is located in the Netherlands. -Rik

12 years, 2 months

SHOgraphics X/PEX terminals wanted

by legalize＠xmission.com

Got one laying around? I'd really like a PEX terminal for my Computer Graphics Museum. <http://computergraphicsmuseum.org> -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

12 years, 2 months

Wanted: Commodore CBM disk drive cable

by dm561＠torfree.net

------ Original Message: Date: Fri, 17 Feb 2012 20:34:19 -0500 From: Dan Veeneman <dan at decodesystems.com> > Hello, > First, thanks to Jay West et al for bringing the list back to life. -- Ditto! -- >I'm looking for a source for the data cable that connects a Commodore PET, >CBM 8032 to a Commodore 4040 dual disk drive. The cable has an IEEE-488 >connector on one end and a female PCB connector on the other. > Any leads would be appreciated. Thanks! > Cheers, > Dan Toronto PET Users Group store: http://www.tpug.ca/index.php?option=com_content&view=article&id=73&Itemid=70

12 years, 2 months

Commodore 1581 repair conclusion

by alhartman＠yahoo.com

While not a 6502, 6809E chips fail on the Coco quite often. The cartridge connector is directly connected to the processor without buffering or protection of any kind. Removing a cartridge, or jostling the disk controller cartridge with the power on can short lines and kill the chip. Cloud9 sells a board that one can install with a 6809E or the Hitachi version of the 6809 (6309) to protect the processor. http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/Pro-TectorPlus.html I haven't bought one yet, because I bought 68B09E chips from Jameco for $5 each. I've only seen one Coco with a blown chip, and I got it that way. Al

12 years, 2 months

VAXstation 3100 Free To A Good Home

by robert.jarratt＠ntlworld.com

I have a VAXstation 3100 that I would like to pass on. I acquired it recently and I have successfully booted it into VMS over the network. It does not have a disk. I am based in Stockport, UK and would prefer collection in person. Regards Rob

12 years, 2 months

Debugging CRT monitors (Philips CM8833 Mk2 / Acorn AKF17)

by classiccmp＠philpem.me.uk

I've got an Acorn AKF-17 on my workbench, serving duty as a test monitor and the display for my Acorn A3000. For those not in the know, it's essentially a Philips CM8833 Mk.II chassis with most of the inputs blanked off. It's actually quite a nice monitor, except the power switch is on the back (I prefer front-mounted power switches) and it's not quite as nice looking as the metal-case Microvitec Cub (which has a nice industrial look going for it). Here's the catch. It seems to have a bit of a problem in the video synchronisation department. Specifically, the picture rolls vertically (from bottom to top), and seems to move to the right as it does so. In other words, a vertical line turns into a forward-slash. Has anyone worked on one of these "fine" monitors (CM8833, CM8833 Mk2, AKF17 or one of the many re-brands e.g. Atari SC1435) before? What should I be staring daggers at first? Does anyone know where I might be able to get a service manual (or at least a schematic set)? I've got the Mk1 schematics and service manual, but not the Mk2. Apparently someone posted them to Rapidshare last year but the link is now rather dead :( Also, does anyone know where I might be able to get a new power switch? Apparently it's an ITT ME5A, Philips 12NC number 4822 276 11504 though I can't confirm this (I don't have an AKF17 or CM8833mk2 service manual). I've ruled out the A3000 -- MonitorType is 0 (TV-rate monitor) and Sync is 0 too (composite sync). If I switch to Separate Sync (MT0/SYNC1), my LCD monitor (an NEC EA231WMi) will lock on and display video... Cheers, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

12 years, 2 months

Commodore 1581 repair conclusion

by derschjo＠mail.msu.edu

A couple of weeks back I wrote to the list asking for advice on fixing a C1581 drive (and thanks again for all the suggestions!). I now have the drive working again so I thought I'd detail my experience in case it helps someone else... Symptoms: Both LEDs (red & green) stuck on constantly, no response from drive via serial port. Drive does seek back to track zero on powerup. Power supply good. Initially, I had assumed that because the drive was seeking back to track zero on startup, that the CPU was running properly. (I later discovered that this is actually incorrect -- the 3.5" drive unit in the 1581 (an 800K unit identical to those used in the Amiga 500) does this operation itself when it is powered up.) The CPU's clock pin was pulsing so at least -something- was running. The EPROM and WD floppy controller chip are socketed in my unit. There were no visible signs of life on the WD control pins. Dumped the EPROM and verified its contents (they were good). Since the WD controller was socketed and I had a spare, I swapped it out. No joy there. At this point, lacking any other diagnostic information I decided to monitor the CPU's Address and Data lines to see if I could work out what it was trying and failing to do at powerup. Thanks to a new 40-pin DIP clip (thanks again, Ian!) it was pretty easy to connect up my logic analyzer (a Tek 1241 for those curious) and it pretty quickly became clear that while the CPU was running, it wasn't functioning properly at all. No matter how I looked at the address & data I couldn't work how it could possibly be running a valid program. Data matched up to the addresses being read (for addresses within the EPROM's address range anyway) but the ordering of the addresses did not seem to correspond to a running program. I desoldered the 6502 and stuck it in a working Apple II, and sure enough the Apple would not run with the 1581's CPU. I installed a replacement 6502 in the 1581 and I'm happy to report that it now works properly again! I believe this is the first time I've run into a faulty CPU in a vintage computer (or peripheral). - Josh

12 years, 2 months

IC Manufacturer Logo Listing?

by brain＠jbrain.com

From a friend just getting back into hardware: "I'm wanting to catalog a large collection of chips that my Dad had so I know what I have... 7400 chips are easy to find / grab the datasheets for... Others I'm having issues as it appears manufacturer's have used the same number various times; often times locating on the web is a problem even finding the number... Major question is : 1) Is there a list of somewhere that I can use to identify the chip manufacturer's logo? Some of these chips are from the 70's. " I'm not a "vintage IC" knowledgable person, but I would be happy to pass on any links provided. I also asked him to snap some pics of ICs, and maybe folks here could point him to relevant datasheets for some of them. Jim -- Jim Brain brain at jbrain.com www.jbrain.com

12 years, 2 months

Who wants a nice monitor (UK)?

by jonas＠otter.se

>> > I guess I'm a total anorak, but there was a TNIX.. >> > >> > [Tektronix Unix, running on a PDP11/23-based development sustem] >> I own one of those and BTW I am looking for software for it. The >> hard >> disk needs a fsck(8) and this is a stand alone tool. Unfortunately I >> didn't get those floppies with the machine. > > I _may_ have the distribution kit for my machine I will see what I > can find. > > -tony > ISTR fsck needed to be run quite often on the 8560. Not the world's most stable system :-( But IIRC Tnix is simply AT&T Unix version 7 with bits taken out and other bits added on, so fsck should be the standard Unix v7 fsck for the PDP-11. I suppose that could be found elsewhere? Or would it have been modified to suit Tek's hardware? /Jonas

12 years, 2 months

Who wants a nice monitor (UK)?

by pete＠dunnington.plus.com

I've had to have a bit of a tidy up, and I have to part with the nice Sony monitor off one of my SGI INdys. Sony GDM-17E21 17" CRT, colour "granite" grey, to match an Indy or O2 keyboard. Dual inputs: HD15 "VGA" connector and 5 BNC (R/G/B/HS/VS). Not used for a few years but should be in good order. I can't ship this because I can't find a box and packing large enough, so it will have to be collected from York, UK. It also can't stay here long; it was going to the electrical waste this weekend before I put my foot down. But it might stay a few extra days if someone guarantees to collect it. -- Pete Peter Turnbull Network Manager University of York

12 years, 2 months

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test-drb February 2012