test-drb March 2003

test-drb@ccmp.vtda.org

314 participants
633 discussions

by melamy＠earthlink.net

yea, but you aren't allowed to list children on eBay... >--- Original Message --- >From: "Wayne M. Smith" <wmsmith(a)earthlink.net> >To: <cctalk(a)classiccmp.org> >Date: 3/7/03 12:33:35 AM > > On Thu, 6 Mar 2003, David Gari wrote: >> >> > I thought you old hardware hounds would appreciate this one: >> > >> > My pride and joy - a MITS Altair 8800a is for sale at: >> >> Hi David. >> >> Why on Earth would you be selling your "pride and joy"? >> >> -- >> >> Sellam Ismail Vintage >> Computer Festival > >Either because (1) it isn't, or (2) he's got another one. But, frankly, >it's like selling one of your children.

21 years, 3 months

Locating older systems & parts... (was: RE: making disk image s)

by Robert_Feldman＠jdedwards.com

The thrifts I go to here in Chicago are not too bad about desktop systems ($10-$20 for 386/486 boxes, $5-$20 for monitors), but any laptop _starts_ at $50, even XT or AT-class ones. A marginally useable 486 will most likely be $150. I usually don't even bother with the hardware -- I go looking for old MS-DOS software. -----Original Message----- From: Robert F. Schaefer [mailto:rschaefe@gcfn.org] Sent: Thursday, March 06, 2003 6:02 PM To: cctalk(a)classiccmp.org Subject: Re: Locating older systems & parts... (was: RE: making disk images) <snip> I've heard many Texans on the list say something like `I passed up the quad Xeon box at the salvation army 'cause it only had a half-gig of ram and they wanted 45 bucks for it.' Ok, maybe not quite like that, but the stuff they talked about would *never* be seen in a local store, or priced higher than new. Literally. The local $thrift_store_charities are hell-bent on making a profit, and it bugs the crap outta me to see them selling junk, for obscene prices, to poor people who might not know any better. Whoops-- sorry. </rant> <snip> Bob

21 years, 3 months

MITS Altair 8800a for sale on eBay

by dgari＠msn.com

I thought you old hardware hounds would appreciate this one: My pride and joy - a MITS Altair 8800a is for sale at: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3404786716 Current bid is at $1247 and auction ends Mar-14-03 14:40:40 PST Many thanks. _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

21 years, 3 months

Items for free

by Jamie.Ontiveros＠wcom.com

Rich, I'm guessing that all of the items that you had to give away for free have already been distributed. If not...I am interested in the very last item. If so, do you know where I can get one? :) - Megahertz External Token Ring Adapter for Toshiba T1000SE/XE/LE, T1200XE, T2000SX, original box, manual, disks The URL to your post is below. http://www.classiccmp.org/pipermail/cctech/2002-October/002964.html Thanks, Jamie

21 years, 3 months

PDP-11/34 PSU Yet Again

by jss＠subatomix.com

Well, I finally got around to testing the PSU on my 11/34. I measured at the backplane connectors with no backplanes plugged in. Everything checks out except for the -5V and +20V. Accordingly, the LED at the bottom of the H745 brick (regulator 1) does not light. However, some of the other voltages coming from the H745 (according to the BA11-K FMPS) seem to be OK. Does anything in the machine even need -5V or +20V? If not, can I leave the bad brick in place? I have: KD11-EA, KY11-LB, DL11-W, MS11-JP, M7850 parity, DZ11-A, RK11-D. I'll be adding a RX11 at some point. Someone enlighten me, please. :-) I'm pretty sure I have a spare brick. Also: what are these signals on the 6-pin backplane mate-n-locks? - AC LO - DC LO Something I learned: If you have a H785 brick in your 11/34 BA11-KA cabinet, ignore what the 11/34 and KY11-LB manuals say about battery backup and the rotary power switch. You can indeed have a battery backup with a BA11-K, and the switch on the KY11-LB works as you think it should. You must connect the ribbon cable from the H785 to the corresponding connector on the KY11-LB, or the H785 won't work. You must NOT connect the one-wire connector from the H785 to P4(?) of the AC input box, or else your machine won't turn off, regardless of the rotary switch. Clear as mud? -- Jeffrey Sharp

21 years, 3 months

WTD: AMD or Intel 80387 Math Coprocessor IC

by philpem＠dsl.pipex.com

Hi all, I'm trying to track down a 387 math coprocessor IC for an old 386-based Linux box that's going to be doing a bit of numbercrunching for me. Has anyone here got an AMD or Intel (AMD preferred) 387 coprocessor rated at 40MHz (-40 part number suffix) that would work correctly with an AMD Am386DX-40? No, before you ask, the 386DX does *not* have a built in mathco - the 486DX was (IIRC) the first DX-series chip with a built-in coprocessor. Thanks. -- Phil. philpem(a)dsl.pipex.com http://www.philpem.dsl.pipex.com/

21 years, 3 months

Northstar Single Density Controller info MDC-A4

by melamy＠earthlink.net

Hi all, I have put my Intel MDS system on hold while I await some hardware information in the mail. I am resurrecting the second half of my project which is to get a Northstar system up and running so I can develop the ISIS-II code again. The problem I have at the moment is that I need the schematics for the MDC-A4 controller. I have two manuals on the double density controller but nothing on the one I am using. Does anyone have the manual available with troubleshooting info or at least the schematics. I am more than willing to scan docs I have in trade. I am off troubleshooting the controller because it will not write properly. I can load a fresh copy of DOS, customize the I/O and actually run DOS now, but I can't update and make a new copy because of the write issue. I did manage to fix an Applied Microsystems EM180B Z80B emulator today so I could enter the console code and run things. Thanks! best regards, Steve Thatcher

21 years, 3 months

PCjr 1.44 floppy controller

by nampcjr＠yahoo.com

I am curious if anyone ever had one of the Legacy Enhanced Floppy Controllers for the PCjr, was ever able to duplicate one, or know if it was ever possible to modify the current controller to take on a 1.44mb capacity. I have a Racore unit with a modified 3.5" 1.44mb drive that acts as 720kb, and is fantastic, but would love that extra storage space if available! Brian

21 years, 3 months

Dragon 64

by alhartman＠yahoo.com

oops! Guess that was wrong. I can remember using a Tandy Controller on a Dragon 32 once. But, I guess that one had hacked Coco ROMS. That might be what I do with this unit, hack a set Coco ROMS to go into it, just to get it working again. With a new unit at $35.00, it might not make much sense to try to get this one working again. My Coco III is also dead. Green box with no text. I think the 6809 is bad. At least, that's what I've been told about these units. So, I'd have to desolder it and put another one in just to diagnose it. I may do that some weekend when I feel adventurous. Suddenly caught the old computer bug.... Al > From: tlindner(a)ix.netcom.com (tim lindner) > > > I know I can use a Tandy Controller, but I think > > I'll need a different Disk Basic ROM for it. If > > anyone can help with that, I'd be obliged... > > Lets see... > > The Tandy controller/software uses the following: > > Read byte, store byte, halt CPU, un-halt CPU, > repeat. NMI when done. > > The Dragon controller/software uses the following: > > SYNC, interrupt, read byte, store byte, repeat. NMI > when done. > > On the Tandy controller DSKREG is $FF40, and the > wd179x is mapped > between $FF48-$FF51. > > On the Dragon controller DSKREG is $FF48, and the > wd179x is mapped > between $FF40-$FF43. > > Also the bit patterns for DSKREG are different > between the Tandy and > Dragon controllers: > > * > --------------------------------------------------------------- > * DSKREG - the control register > * CoCo ($ff40) Dragon > ($ff48) > * > * Bit Bit > * 7 halt enable flag 7 not used > * 6 drive select #3 6 not used > * 5 density (0=single, 1=double) 5 NMI enable > flag > * and NMI enable flag > * 4 write precompensation 4 write > precompensation > * 3 drive motor activation 3 single > density enable > * 2 drive select #2 2 drive > motor activation > * 1 drive select #1 1 drive > select high bit > * 0 drive select #0 0 drive > select low bit > > > It would take some serious hacking to transform a > CoCo FDC into a Dragon > FDC. > > -- > The ears are too length. > -------------------------------------------------------- > tim lindner > tlindner(a)ix.netcom.com

21 years, 3 months

pinout of connectors on H777 PSU

by quapla＠xs4all.nl

Hi all, Is there someone who knows the values/meanings of the pins on the connectors (the ones at the back) of a H777 PSU? Thanks, Ed --

21 years, 3 months

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test-drb March 2003