test-drb May 2005

test-drb@ccmp.vtda.org

248 participants
723 discussions

WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic

by leeedavison＠yahoo.co.uk

>> I'm after a 5.25" 80-track (preferably 40/80 switchable) DSDD drive, > Never heard of that, and I can't seen any way it could possibly work. > If you need to be able to write 40-track and 80-track diskettes, you > need two drives. It was common practice to use 96 tpi drives for both 40 and 80 track disks on BBC micro systems. If someone only had a 48 tpi drive and couldn't read the disk written on the 96 tpi drive the usual solution was to format it on the 48 tpi drive and then re-write it on the 96 tpi drive. Cumana dual 40/80 disk units seem to use Mitsubishi M4853 drives. Lee. . ___________________________________________________________ How much free photo storage do you get? Store your holiday snaps for FREE with Yahoo! Photos http://uk.photos.yahoo.com

19 years, 1 month

Need Digital VT102 and Hewlett-Packard A1099B Keyboards

by bqt＠Update.UU.SE

On Sun, 29 May 2005 shoppa_classiccmp at trailing-edge.com wrote: > > I need a VT102 keyboard (the original DEC one) > > Didn't all the VT1xx use the same keyboard, the one with the stereo > phone plug on the end? > > That makes it easier, you just need any VT100-type keybaord. Not exactly, but enough to be substitutable. The VT100 keyboard have four used controlled LEDs, called L1 to L4. The VT102 keyboard only have one user controllable LED, called L1. The other three LEDs are used by something else, but I cannot exactly remember what right now, and all those keyboards are about 80km from where I am, so I cannot check. Johnny Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at update.uu.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

19 years, 1 month

WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic

by leeedavison＠yahoo.co.uk

> so that leaves an 80 track still to find Any of these should work .. Micropolis 115V Mitsubishi M4853 Shugart SA465 Tandon TM55-4 Tandon TM100-4 Teac FD-55F Y.E. Data YD580 Cheers, Lee. . ___________________________________________________________ How much free photo storage do you get? Store your holiday snaps for FREE with Yahoo! Photos http://uk.photos.yahoo.com

19 years, 1 month

Early IBM Computers, history info

by chenmel＠earthlink.net

Because somebody mentioned RAMAC in a thread, I dug out something my father gave me awhile back, the 25th Anniverary Edition of the 'IBM Journal of Research and Development' a thich issue published in September 1981. It is mostly made up of historical articles. In particular there is a 'survey' article 'The Architecture of IBM's Early Computers' which is a technical comparison of all IBM Computers from 1949 to 1964. It discusses the 701, 702, 650, 1401 series, and RAMAC and Stretch. It's not a long article (13 pages) but is rich in technical descriptions. Is this article already available somewhere online? The copyright notice says 'Copying is permitted without payment of royalty provided that (1) each reproduction is done without alteration and (2) the Journal reference and IBM copyright notice are included on the first page' Should I scan this article? Where should it be made available? (i.e. where should I upload it?) ----- Really, paging through the whole journal (it's very thick), it should ALL be made available somewhere, if it isn't already. There is TONS of fairly rich historical info in it. Main sections include: System Architecture and Development Software Technology Component Development and Manufacturing Technology Magnetic Recording Technology Printing Technology IBM Scientific Contributions There are articles covering the history of the development of Magnetic Tape Storage, the disk drive, programming languages, the typewriter, etc. It's about 500 pages in all. Is anybody interested in carefully scanning the whole thing? I could be persuaded to loan it to somebody active on the list (where 'peer credibility' would guarantee it's return to me) who wants to scan it to share, and who would return it intact.

19 years, 1 month

Free stuff, please take them. (UK)

by classiccmp.org＠irrelevant.fsnet.co.uk

Hi.. ok, I have the following items that I have to get rid off SOON to make some space. somebody please take them away before they hit a skip.. IBM XT 5160 (unchecked) 2 off 8 pack floppy changers. (unchecked, came with the XT but may be unrelated, only one cartridge) IBM 8513002 13" VGA colour monitor (OK) Wyse 550 VGA mono monitor (OK) Three or more serial terminals, at least 2 of which are Wyse. A couple of epson wide carriage dot matrix printers At least three complete working clone 486 machines PeeCees with CD-Rom & network cards (they were actually set up to run as Windows terminal-server terminals) Several clone Pentium 1 PeeCees of various specifications. A fair selection of PC keyboards & serial mice. Various otherwise unremarkable monitors. Desk-height, PC server cabinet, on casters, AT form factor) Non-computer stuff: I've also got a couple of TVs (one sort-of working, and one occasionally-working) and a metal framed high bed to shift ... All of the above is FREE to anybody who can collect it from Salford/Manchester. I will consider posting items if absolutely nobody else will collect.. (probably about ?10 an item, anywhere in UK, via carrier.) I will even consider delivering, but will have to charge based on time & distance. Preference definitely goes to anybody willing to take all or most of it! Cheers, Rob.

19 years, 1 month

TurboROM Kaypro Update

by doc＠mdrconsult.com

I had asked last week or so about a system disk for a Kaypro II equipped with a WD hard disk controller and Rodime drive, Advent TurboROM v3.0, an Advent .5MB RAM drive, and an Advent floppy personality module. Allison offered to provide a system disk made on a Kaypro 4/84 w/ turborom, but has a time-critical prior project that prevents restoring 5.25" disks to the 4/84 right now. I had also asked on the CP/M newsgroup, and somebody there sent me a set of teledisk images that might help. The Support and Developer SSDD disks for a turborom'ed K-II, which are unfortunately not bootable, and the DSDD Software Support Disk that came with the TurboROM purchased for his own K10. I have a Mitsubishi MF501A-352U DSDD drive (with full-height black face-plate, no less), so I have it temporarily replacing the Kaypro's Tandon TM100-1A. And the K10 Software Support disk finally got me to an A0> prompt! It looks like the turborom is fairly model- and version-agnostic. The hard drive formatter (K10FMT.COM) works, as do TURBOGEN.COM and MOVTURBO.COM, so I can now boot from the hard disk. :) I'm not CP/M-savvy at all, but it looks like I have enough here to make this a functional system. Allison, I appreciate the encouragement and the info. I'd like to stick a pair of 3.5" drives in, so if you do run across the DIP switch settings for the floppy personality module, I'd like to have that. And a system disk would still be interesting when your other work slows down. Randy, Teledisk images will be forthcoming, now that I know my PeeCee reads and writes valid images and disks. And finally, a question - does the Kaypro support a serial console at all? The VDT is OK, but it's tiny. :\ Doc

19 years, 1 month

Available: HP-2020 / DEC TU20 7-track drive

by Tim＠rikers.org

Installed January 1970. needs repair. missing pieces. http://rikers.org/gallery/hardware-hp2020 This drive was salvaged with the HP-2116A system I'm restoring. From what I can tell it was made by Datamec for HP. I think Datamec called it a D-2020. Looks like Datamec also made the TU20 for DEC that was available with the PDP-9. I also see references to a DEC-545 7-track drive. They appear to be the same transport. It sounds like MIT used to have a bunch of these. I read that the heads tend to wear out. The heads on this unit look fine visually. This unit is missing the front cover for the drive. It's also missing the cover over the I/O cards. One of the 7 "dual density write" boards is missing, but could be duplicated from one of the 6 existing boards. There are cables that don't hook up anywhere, so I would guess something else is missing, or that I'm just overlooking something obvious. The drive is located in Dallas. I'm planning to move soon. I don't think I'll ever get around to restoring this drive. I have no 7-track media. =/ It's free to whoever asks for it first. I'd prefer someone picks it up. It would be possible to ship it, but it's HEAVY and fragile. Not a good combination. Looks like these folks have 2 TU20's: http://www.aconit.org/collection/restauration_pdp9/a_restpdp9_2.php Someone give this baby a good home? ;-) This and other stuff I'm clearing out is listed here: http://rikers.org/wiki/FreeHardware -- Tim Riker - http://rikers.org/ - TimR at Debian.org Embedded Linux Technologist BZFlag maintainer - http://BZFlag.org/ - for fun!

19 years, 1 month

Remembering RAMAC

by dwight.elvey＠amd.com

>From: "Vintage Computer Festival" <vcf at siconic.com> > ---snip--- > >I was thinking more in terms of space. A disk is much more efficient in >this regard. You can stack N times the number of disks in the same space >that a drum takes up. > The problem with disk, of course, is the variable BPI. Today, with the electronics so cheap, the CD-ROM is made with a spiral track and it runs at a constant BPI by changing the rotation speed as it reads the disk. Dwight

19 years, 1 month

Fluke 9010A revisions/upgrades

by jcwren＠jcwren.com

I have two 9010As, one with revision 2C, and the other with 3A. I've seen units on eBay with 3C, also. Does anyone have a list of differences between the various versions, and what it takes to upgrade a unit? I've had both my units disassembled, but not at the same time, so I'm unsure if there are any hardware changes between revisions. --jc

19 years, 1 month

Need specs for IBM PC Convertible power supply

by vcf＠siconic.com

Dag nerbit. I have an IBM PC Convertible and the manual, but I am lacking the power supply and the manual does not contain specifications (at least I couldn't find any). Does anyone know the specs on the power supply for this? Shanks! -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

19 years, 1 month

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test-drb May 2005