test-drb June 2007

test-drb@ccmp.vtda.org

224 participants
486 discussions

by Billy.Pettit＠wdc.com

Jay West wrote: Billy wrote... >> Come on people: there were computers long before there were >> microcomputers. I seem to remember a recent post complaining that this list was nothing but minicomputer and big-iron talk, no microcomputer discussion. Apparently that was wrong, as now there is a complaint it's just micro talk? ;) Jay ------------ Jay, I wasn't complaining about the list or the subject matter - I'm quite content to see all sorts of ramblings, even some off subject. I was trying to make the point that a computer built around a microprocessor is not particularly weird or unusual - The subject of the thread. Billy

17 years

LISA

by aek＠bitsavers.org

> So, does anyone know what happened to that 90,000+ lines of (Pascal) Source Code for LOS? Last time I saw it, it was on a Lisa in the source control library at Apple > It would sure been neet to be able to look at it. I agree. The Computer History Museum is willing to archive it. All you have to do is ask Steve to release it. I'm sure he has nothing better to do today.

17 years

RX02 parallel port interface (was Re: Linux PCB CAD software?)

by ethan.dicks＠gmail.com

On 6/29/07, Bruce Ray <bkr at wildharecomputers.com> wrote: > Before leaving the RX01 topic, note that Chuck's design was implemented > using the Cadsoft Eagle years ago and is available at: > > http://www.wildharecomputers.com/download/rx0x/rx01-b.zip > > A minor update is at: > > http://www.wildharecomputers.com/download/rx0x/rx01-d.zip Thanks for those. > The idea of putting an SX-28 processor in control of the communications and > using a native USB interface resulted in the (untested) derivative design > at: > > http://www.wildharecomputers.com/download/rx0x/rx-usb.zip I'll have to look at that. I have, in hand, an ATMEGA8 bridging USB to a textual LCD panel for LCDproc / LCD4LINUX, etc. The USB implementation is in software, keeping the project cost quite low ($3.25 for an ATMEGA8 in low quantities, AFAIK). I might have to see if I can take what you have there and see if an ATMEGA8 can do it, too. I hate the fact that the parallel port is vanishing, but since I can't keep it from happening, I might as well attempt to keep classic peripherals working with hardware that's out now and in the near future. -ethan

17 years

Seagate ST1480N termpwr jumpers

by julesrichardsonuk＠yahoo.co.uk

Does anyone happen to have a reference for the termpwr jumpers on a Seagate ST1480N 425MB SCSI disk? The only online reference I've found so far is set out to use the old DOS font with line drawing characters in it, and nothing I've been able to find in Firefox (or elsewhere in Linux) has been able to display it properly :-( I know the termpwr jumpers are 7 and 8 down the left side of the drive, but deciphering the characters used in the corresponding truth table is proving tricky. (I've having another look at the NeXT Cube; I assume that the drive is currently expecting termpwr from the bus, but the NeXT isn't supplying it) ta J.

17 years

Semi-OT: Interesting or unusual PC Compatibles?

by feldman.r＠comcast.net

>Message: 13 >Date: Wed, 27 Jun 2007 08:18:09 -0400 >From: "Jason McBrien" <jbmcb1 at gmail.com> >Subject: Re: Semi-OT: Interesting or unusual PC Compatibles? >To: "General Discussion: On-Topic and Off-Topic Posts" >On 6/26/07, Dave McGuire <mcguire at neurotica.com> wrote: >> In the "odd PCs" department, I have to mention the Seequa >> Chameleon. It has an 8088 and a Z80, so it can run DOS, CP/M-80, or >> CP/M-86. >The DEC Rainbow 100 was a similar machine, it had a 8086 and a Z/80, and >could triple (or quad) boot into CPM/80, CPM/86, MS-DOS, or act as a VT-220 >via hardware emulation. It didn't get far as it used wacky 400Kb single >sided quad density floppies that hardly anyone else used. According to >Wikipedia, DEC even ported Windows 1.0 to it. Add the Otrona Attache 8:16 to that list. It used an 8086 daughter card to run MS-DOS 2.11. It had trouble with WordPerfect, though, as the keyboard did not have the PC function keys. It also did PC graphics in software, so a program like Borland's Reflex database redrew the screen _very_ slowly when you scrolled. >A couple more oddities- >The Tandy 2000 was one of the few 80186 based clones, and ran well behaved >MS-DOS apps, though it had somewhat oddball video hardware, keyboard and >serial port setup. It required a custom version of DOS, and MS even ported >Xenix to it. The HP 100LX/200LX palmtops used a custom 80186 and ran most DOS applications, running MS-DOS 5.0 from ROM. There could be problems with the LX's graphics, which was 640x200 CGA with some quirks. >The Atari Portfolio was probably the first palmtop device that ran DOS apps, >though it was such a wacky architecture it's software support was limited. The Poqet came out shortly after the Portfolio, IIRC. Ran quite a few DOS apps under MS-DOS 3.3 -- the Poqet PC website (http://www.bmason.com/PoqetPC/faq/poqetpc.html) calls it "about 99.9% compatible with the original IBM/PC-XT desktop computer." >The HP 100 series were some of the first laptop computers that could run >DOS. It had DOS, Basic, Lotus and a few other productivity apps in ROM, and >used the somewhat odd HP-IL bus to interface with peripherals, among them a >battery powered disk drive.

17 years

HP7202A Schematics questions

by wacarder＠earthlink.net

>>>http://www.woffordwitch.com/HP7202A.asp >>> >>>and click on the link at the bottom of the page. >> >> Can someone help me understand these old HP schematics? > >I can't see them. I get "The page cannot be found". > > Vince Sorry, the first time I mis-typed the URL. Here's the correct one: http://www.woffordwitch.com/HP7202.asp Ashley

17 years

Telephony switches - is there anyone out there collecting these?

by James＠jdfogg.com

> Are there people out there, on the list or otherwise, that > are actively collecting these machines? Admittedly, unlike a > PDP8 you can use (as Dave McGuire does) on a daily basis, a > twelve ton NEAX isn't too 'dramatic' as an attention piece. > But, according to my little book here, they tend to be > multiprocessor, reel-to-reel storage (as they 'reboot' so > infrequently they need a very long-lasting storage medium), > all sorts of good stuff. > And with an average "Mean time between failure of 1 failure > in 40 years"... boy, that just speaks for it. > > So, anyone out there have one of these in their... basement? I'm into telephony, but not on the CO-sized equipment. I've had many PBX's in my houses over the years. Everything from an AT&T 1A2 system (relay based) to an AT&T System 75. Along the way I've had AT&T, Siemens, Nortel, Lucent, Iwatsu, Mitel, NEC and others. At this point I'm using a 32 line, 128 station Iwatsu ZTD. I have many digital (Key) phones for it, operator/programmer consoles, doorphones, analog and digital (Key) station cards, ringer supplies, relay boards and lots of other neet options for them. And I have the all-important documentation to make it run. It's one of these. http://shorterlink.org/2642 (ebay link) The only old CO equipment I know of in private hands is a guy in Pennsylvania that runs a boys camp on a Strowger (relay CO).

17 years

HP7202A Schematics questions

by wacarder＠earthlink.net

>>The interface has a 15 pin male adapter, with >>8 pins on top and 7 on bottom. >> >>I have added a link to the schematics at the bottom of >>the HP7202A Plotter page on my web site. >> >>Go to: >> >>http://www.woffordwitch.com/HP7202A.asp >> >>and click on the link at the bottom of the page. > >Can someone help me understand these old HP schematics? >I see the 15 adapter pins shown at the top right of the >page, and see where one of the pins (# 5) appears to go >to something labeled EIA IN on the "Logic Mother Board" >section. Some pins (3, 4, and 6) appear to not be >connected to anything. Most of the others seem to go >to the Analog Mother Board, but I am not sure how to >follow them from there. What would be nice is if I >could get enough of an understanding from this schematic >to figure out how to construct both a 20mA adapter and >an EIA (RS232) adapter, or an adapter that has the 15 >pin connector on one end, and two connectors on the >other end (one for 20mA and one for EIA). I apologize for posting an incorrect link to the schematics. They can be found at the bottom of the following page: http://www.woffordwitch.com/HP7202.asp Ashley http://www.woffordwitch.com

17 years

Old Modems and Telephony switches

by Arno_1983＠gmx.de

> How about early modems, anyone collect them? Not nearly as intensively as I'd like to (lack of space, for the most part), but I do have one big old (originally Telco-rented) Siemens 1200 baud leased-line modem. The usual couple of paperback-sized "modern" modems (up to 28.8 kbps, I think) - they're one of those items where people always seem to misplace the wall warts and that just as invariably don't state their power requirements on the case. Not oftenly used but kept "just in case". I've got a lead on some four-wire and X.25 ("frame relay"?) stuff from University and just yesterday I got my second ADSL modem. What would it take to set up or "simulate" their counterpart (DSLAM?) at home? Concerning other phone stuff, I do have one relay-based master/slave (or is that boss/secretary?) switch, one or two analog PBXen and one proprietary unit by Telenorma (for which I don't have the displayphones you need at least one of for programming). On the ISDN side, just two phones (one missing its local power supply too - duh), one or two PC cards and an NTBA so far. You can't even make the two phones talk to each other using just the NTBA (as long as you don't have ISDN service) afaik, so I'm looking for an ISDN PBX as well (or some other suggestions how to have some fun with that stuff). So long, -- Arno Kletzander Stud. Hilfskraft Informatik Sammlung Erlangen www.iser.uni-erlangen.de Psssst! Schon vom neuen GMX MultiMessenger geh?rt? Der kanns mit allen: http://www.gmx.net/de/go/multimessenger

17 years

AVAIL: Xerox 630 Memorywriter system disks

by marasco＠insightbb.com

I might be interested in your Xerox 630 Memorywriter system disks. Please email me at davidsharon at insightbb.com with price. Thanks, David This transmission is confidential and intended solely for the person(s) or organization(s) to whom it is addressed. It may contain privileged and/or confidential information. If you are not the intended recipient, you are not authorized to copy, distribute or take any action in reliance on it. If you have received this transmission in error, please notify the sender by reply email and delete this transmission. Thank you for your cooperation.

17 years

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test-drb June 2007