test-drb September 2014

test-drb@ccmp.vtda.org

188 participants
251 discussions

by wlewisiii＠gmail.com

I turned to set up a new to me toy my friend gave me yesterday, a DEC Alphastation 300 4/266. 1 ST12400N, 1 ST31230N, floppy, CD, 1 gb ram. Unknown video. I've plugged in both a VGA & my DEC VRC16 monitors, PS/2 keyboard & mouse and I get no video out on either monitor, only a "keyboard error" on the LEDs on the back of the computer. I've also tried a USB keyboard that is known good via a usb/ps2 adaptor with no joy as well. Any other troubleshooting ideas? Thanks! -- Live like you will never die, love like you've never been hurt, dance like no-one is watching. Alex White

9 years, 8 months

TU56 Motor Run Capacitors.

by bob＠theadamsons.co.uk

I'm refurbishing a TU56 and of course the tape drive motor capacitors are completely shot. They're 100uF and only need to be about 60-80V to be quite safe (originals 100uF/55V) but I can only find capacitors rated for 450V which is no big issue except for their size. I'm thinking of using motor start capacitors. They're only rated intermittent but I feel that the derating to around 60V should probably give them a good lifetime. Views? Bob

9 years, 8 months

Copying protected floppies?

by fozztexx＠fozztexx.com

I got a copy of The Newsroom by Springboard new in the box a few weeks ago. It's for the IBM PC and came on two 360k 5.25" floppies. The first thing I tried to do was make copies of the disks. Unfortunately it's protected and so I'm not exactly sure how to back them up. I tried teledisk but the copy it made doesn't work and Newsroom keeps insisting that I insert the original disk when I try using it on my PC. I read that teledisk was supposed to be able to deal with copy protection, but it clearly doesn't. I don't have a kryoflux. What other options are there for making backups of protected disks? -- Follow me on twitter: @FozzTexx Check out my blog: http://insentricity.com

9 years, 8 months

XTIDE Universal BIOS on IBM PC?

by fozztexx＠fozztexx.com

I saw that the newest versions of the XTIDE Universal BIOS have a way to use the serial port as a disk drive by connecting to another computer running XP. Since my IBM PC doesn't currently have any kind of mass storage, this seemed like it could be handy, even if it might be terribly slow. I don't have an XTIDE card, but I do have a 3com Etherlink II 3c503 that has an empty socket. I burned the 12k xtl ROM to a 27c128 and filled the extra space with zeroes. I put it in the socket and now when the computer boots up I get "DC00 ROM" on the screen just before it tries to boot from a floppy. However that's it. I tried holding down the Alt key to get it to give me a menu or scan the serial ports, but nothing happens. Is there some trick to making the XTIDE ROM work in the 3c503 socket? -- Follow me on twitter: @FozzTexx Check out my blog: http://insentricity.com

9 years, 8 months

Looking for XXDP EQKCE1 (11/70 instruction exerciser) source listing

by derschjo＠gmail.com

Hi all -- I'm assisting in bringing an 11/70 back to life and it's passing most diagnostics at this point, but the EQKCE1 (cpu exerciser) diagnostic is failing without any diagnostic message -- it's simply halting. I'd like to figure out what the test is doing before it dies, and before I resort to disassembling the code manually I was wondering if anyone happens to have a source listing for this. I haven't been able to dig one up online thus far... Thanks, Josh

9 years, 8 months

IBM archive

by sales＠elecplus.com

I just came across this old archive, maybe it is new to some of you. http://ps-2.kev009.com/ Cindy Croxton

9 years, 8 months

FS: PDP Systems in UK

by silvercreekvalley＠yahoo.com

Hi, I'm clearing some space in the attic so have various PDP systems available in the UK. In the main these are the desk side style case (can be rackmounted) with 11/83, or similar. All feature a 5.25" hard-disk and floppy (dual DEC style) and one or more serial connections. These are nice systems to use, a bit quieter than UNIBUS :). I also have lots of QBUS cards, memory, etc and CPU boards including some more recent (faster) Mentec boards (M100, etc) with on board RAM, FPU and serial ports. Email if interested. These systems are available in either Bucks (near London) or Yorkshire. Thanks

9 years, 8 months

Xylogics

by jhfinedp3k＠compsys.to

I have a Xylogics manual: WIZARD I Installation Manual Documentation Number: 900-008-300 Revision: A Date: October 25, 1978 Estimate about 500 pages (250 double sided pages) I do not have the hardware and will be discarding the manual unless it has not been scanned and is needed. Jerome Fine

9 years, 8 months

DECmate II H7842A and H7842B PSU Pinouts?

by bobvines00＠gmail.com

> Date: Sat, 6 Sep 2014 21:06:27 +0100 (BST) > From: ard at p850ug1.demon.co.uk (Tony Duell) > To: cctalk at classiccmp.org > Subject: Re: DECmate II H7842A and H7842B PSU Pinouts? > >> >> Rainbow Printset? http://bitsavers.trailing-edge.com/pdf/dec/rainbow/ >> >> * MP01722_PC100*-*B_Rainbow_Schematic_Jul84*.*pdf*, 2013-11-20 14:54, >> 3.3M >> >> Also: >> https://archive.org/details/bitsavers_decrainbowwSchematicJul84_3508632 >> >> Up to the usual DEC standards; no PSU schematic, however. > > And no RMA board, grpahis board, keybaord, monitors, drives. > > For all my diarams are my typcially hand-drawn scribble, I'll stick to > them.... > > My whole set of diagrams is over 100 sheets. I could be convinced to get > the PSU sheets scanend if somebody needs them or something like that... > > -tony Tony, Could you start scanning your diagrams of the PSU & boards that DEC didn't release drawings/schematics for? Especially the Rainbow's H7842B PSU -- I'd really appreciate a copy of that diagram. Thanks, Bob

9 years, 8 months

Ann Arbor Terminals docs posted

by silent700＠gmail.com

(Special attn to AEK and Richard) I have scanned and posted some spec sheets and other promotional literature from Ann Arbor Terminals, Inc., circa 1979: http://chiclassiccomp.org/docs/index.php?dir=%2Fcomputing/AnnArborTerminals I found them buried under mounds of decaying paper in an estate sale basement, so there is some damage, but it's all legible. Feel free to add to your own archives, sites, etc. Richard - I somehow ended up with three entries on Manx for the VT52-Compat model. Please delete the last two. - jht

9 years, 8 months

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test-drb September 2014