test-drb March 2017

test-drb@ccmp.vtda.org

188 participants
235 discussions

by camiel.vanderhoeven＠vmssoftware.com

Does anyone have schematics for an STC (StorageTek) 2920 reel-to-reel tapedrive? I?m trying to solve a tape-loading issue that seems to be power-supply related, and some schematics would be very handy right now? Camiel.

7 years, 9 months

Looking to rehome an Atari ST Colour monitor

by bulk＠blit.ca

Hi folks, I have an Atari colour monitor for the ST series of computers that I'm looking to rehome. Model number is SC 1224, Version 2. I've never attempted to power it up and have no idea if it works. It's free to a good home, provided I don't have to put in a lot of effort. (I'm currently in the middle of packing for a move; I have very little spare time or energy.) I'm in the Toronto area. If anyone wants it, let me know. --Chris -- Chris Reuter http://www.blit.ca "Oh God Lem, you're using science for no good. We took an *oath* we would try to do that less." --Better Off Ted

7 years, 9 months

More interesting (?) stuff from my attic

by bill.gunshannon＠hotmail.com

I have a couple more items for the auction block. Real, original, in good shape: DECWRITER III - LA120 OPERATOR REFERENCE CARD DIGITAL Alpha Architecture Handbook - Special Announbcement Edition - February 1992 - PRELIMINARY INMOS Limited occam 2 Reference Manual (ISBN: 0-13-629312-3 Prentice Hall) Any of them should fit in a USPS Flat Rate Envelope so figure less than $10 postage. bill

7 years, 9 months

GImix Ghost Video Board

by vintagecomputer＠bettercomputing.net

Hoping someone might be able to help me on this. I got a Gimix Ghost SS50 video board today and was trying to find a manual. I'm sure these were used in Gimix's own ghost systems but the very limited info I've come across out there suggests they may have worked with any SS50 system. It basically provides a direct composite video feed out from the computer, I assume bypassing the need for a terminal. I plugged it in and fired it up on my SWTPC 6800 and it is working - I think - it generates a full screen of readable random characters. However it does not put up anything from the computer - that still goes out via terminal. I'm assuming Ghost systems were wired up somehow to use this.. I'm hoping to find a manual that explains how. I don't see a keyboard interface for it anywhere so maybe this went along as a complete Ghost system with hardware I don't have. Thanks if you have anything!

7 years, 9 months

Re: Extracting files off “unknown” 8 inch disks. Any thoughts…

by cctalk＠ibm51xx.net

Chuck, Are these dumb adapters that just convert 34 to 50 or do they so more then that? Thanks. -Ali -------- Original message -------- From: Chuck Guzis via cctalk <cctalk at classiccmp.org> Date: 3/23/17 1:59 PM (GMT-08:00) To: cctalk at classiccmp.org Subject: Re: Extracting files off ?unknown? 8 inch disks. Any thoughts? On 03/23/2017 01:32 PM, Mike Stein via cctalk wrote: > I was just going to suggest the same thing, but I see you (Tez) are > going the FDADAP route; more convenient for sure. > > But the majority of the 34- and 50-pin signals actually line up 1 to >? 1 when aligned pin 34 to pin 50; as a matter of fact I have a system > that uses the same 34-pin cable to connect to both, with just a > jumper or two to select 5 or 8" (the index signal is one IIRC). I've still got a couple of the Microsolutions "adapter cards" with 50- and 34-pin headers.?? They work in reverse as well. --Chuck

7 years, 9 months

eBay: PDP-11/70 backplane?

by jnc＠mercury.lcs.mit.edu

> From: Pontus Pihlgren > The 11/70 backplane is wirewrapped. Oh, right you are! I don't know where my brain has fled to these days! It's actually an MJ11 (-11/70 core memory) backplane (I checked the part number - plus someone pointed out that you can see "MJ11" written somewhere). Noel

7 years, 9 months

Extracting files off “unknown” 8 inch disks. Any thoughts…

by terry＠webweavers.co.nz

Hi, I?ve posted this to the VCF too?apologies for cross-posting. I?d be grateful for any guidance or comments anyone could give me on this problem. Guys in the building next door to me (a Science lab) have found some 8 inch floppy disks. They want to see what?s on them, or at least to archive them. They have no idea what machine these disks were used with, or the software was used to write the files. They may be CP/M, or some other format entirely. I?ve got little experience with 8 inch drives or disk formats. However I have got a bare 8 inch floppy drive (a Mitsubishi M2896-63 Half Height 8inch DSDD), and also a CP/M computer with 8 inch drives (A Panasonic JD-850M). I?m thinking it might be an interesting challenge/project to see if I can read these disks and get files off. However, I imagine given all the unknowns it won?t be easy?perhaps even impossible I see two possible approaches. One is to wire up the 8 inch drive to an MS-DOS machine. I?ll have to build/get a PSU for the drive so it can supply the necessary 24 Volts required. I?ll also have to make up a special drive cable. That info is available. In fact, Chuck gave me some tips a year or so ago. However, once I?ve got the drive successfully wired up, I then need to somehow analysis the disks to see what format they are in. Does anyone know of any software that will do this? I?m aware of disk22, for reading KNOWN CP/M formats but is there anything out there that will analyse a disk from scratch? Search the web has thrown up a few possibilies (MMCPC, Cpmtools) but I haven?t explored them at all. The second approach is to use the Panasonic JD-850M, and find a CP/M program that will analyse an ?unknown? 8 inch disk and read files from said disks into the CP/M environment. I?d somehow get the program into one of my Panasonic 8 inch disks (just how, I?ll need to figure out). I?d also need to figure out how to get the files out of that environment also. Anyway, has anyone else faced this kind of challenge and what are your thoughts? I don?t want to start unless I at least have some chance of success. I?m not hopeful. The more I read the more you seem to need real forensic skills and something like Kyroflux that works at low-level. Thanks Terry (Tez)

7 years, 9 months

Seeking schematics/maintenance prints for DMB32/T1012 and H3033 distribution panel

by ethan.dicks＠gmail.com

Hi, All, With all the recent chatter on the VAX8200 on the simh list, I was motivated to dust mine off and do a little digging. I finally took the plunge and got a DMB32 (right now, all I have are the 4 built-in console ports) but while it was easy enough to find the 8.5"x11"-format user guide and technical manual which describe registers and installation and problem diagnosis, I also want the internal cable pinouts and schematics. I know it's harder to find post-Unibus-era C-sized prints since DEC stopped shipping printsets with every order, so I have to ask, does anyone have any schematics for either the T1012 module, the H3033 I/O bulkhead board, or both? I can likely quickly recreate the schematic for the H3033, it's 10 D-shell connectors (8x DB, 1x DC, 1xDD) and 6 30-pin ribbon cable connectors. Lots of signals, but lots of repetition. The D-shell pinouts are in the documenation I already have. The 30-pin connectors/BI fingers are not. But if the schematics are already available, I don't have to buzz one out. http://manx-docs.org/collections/antonio/dec/dmb32ug1.pdf http://manx-docs.org/collections/antonio/dec/dmb32td1.pdf ftp://bitsavers.informatik.uni-stuttgart.de/pdf/dec/vax/vaxbi/EY-5554E-SG-0002_VAXBI_Adapters_Student_Guide_Feb87.pdf Thanks for any new docs. -ethan

7 years, 9 months

eBay: PDP-11/70 backplane?

by jnc＠mercury.lcs.mit.edu

This: http://www.ebay.com/itm/252820125010 looks like it might be an -11/70 backplane, but I'm too lazy to look up the part number. Noel

7 years, 9 months

Re: Extracting files off “unknown” 8 inch disks. Any thoughts…

by terry＠webweavers.co.nz

>For what it's worth, unless you're intent on *writing* 8" single-density >floppies on the PC, the interconnect between the 8" drive 50-conductor >cable and the PC 34-conductor one is pretty straightforward. You don't >need a FDADAP board for that, although it's very convenient. Yes, and I'm all for convenience given that reading these things will be a challenge enough. I've ordered an FDADAP board and also an FDDC power converter. http://www.dbit.com/fddc.html http://www.dbit.com/fdadap.html Now I just has to wait a week or two for them to arrive! Terry (Tez)

7 years, 9 months

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test-drb March 2017