test-drb

test-drb@ccmp.vtda.org

101090 discussions

by allisonp＠world.std.com

<Now it is possible that the modems I had available then were different <from current ones, this was in 1993 and I was working with 1200 or 2400 <baud modems. No difference. DC on the line was used to sense off hook. It's possible to ignore the associated line status bit, standard software(dialers, terminal emulators" would likely look at it and indicate an error. Most modems use this to indicate a live line and not already in use. Carrier tone (dial tone) is the next level up to indicating a live line and dialing is possible. In any case if these are worked around one modem must be originate and the other answer so the signal sense is correct. While it could be handy and made for a real simple two wire interconnect it's slower than serial direct. <If you can give me references to documents describing modem and phone lin <electrical standards I would appreciate it. Not handy, I'm sure it's on the net. Allison

28 years, 3 months

Help Needed: Kaypro 10 HDD Problems

by allisonp＠world.std.com

< If all else fails you may want to try a low level format on the hard < drive. Boot with a MS-Dos ver 2.10 or later, run debug. At the '_' < prompt type in g=c800:5 which should access the controller rom and < enable you to low level format (it is <crudely> menu driven). Your < Tandon has 306 cylinders, 4 heads and 17 sectors per track. After the < low level format procede with the high level partitioning and < formatting. < Marty That would work if it were a dos box. It's a kaypro CP/M machine with hard disk via host adaptor. However, in all likelyhood there are bad sectors on the drive and a FORMAT of the drive may clear the errors. The problem is that you need the floppies with the disk utilities to do that and restore the OS back to the disk (never minding all the other stuff on it). Unlike dos when I say FORMAT I mean literally a low level format of the media. This unlike the dos initializing of the media to dos file system. Formattig the media will erase all the data and files so if you didn't backup, you loose. How do the bad sectors arise? Heat, age and centrifical force assuming there were no mechanical or electrical events to munge the media. The older ST506/412 and similar drives tended to need a low level format from time to time over their mechanical life. Allison

28 years, 3 months

Amiga 600HD questions

by jfoust＠threedee.com

"Zane H. Healy" <healyzh(a)ix.netcom.com> wrote: >If you have access to USENET the Amiga newsgroups are some of the best left >(man has USENET gone down hill since I first started using it). (Insert sound of crusty old man voice) "I was on the fricking net before they even called it the Internet!" >Just beware the euphoria is running extremally high with everyone waiting for >the big announcement from Amiga, Inc. at "World of Amiga" in London this >weekend. The hype is this announcement will change the face of computing, >PERIOD, and will feature some BIG names. (Insert sound of Monty Python "Black Knight" sketch, appropriate to Amigoids who hop around on one leg shouting "It's not dead yet.") - John Jefferson Computer Museum <http://www.threedee.com/jcm>

28 years, 3 months

What's an HP A900?

by DSEAGRAV＠toad.xkl.com

I found one in (probably) nonoperating condition. Just the CPU box, nothing else. What is it? -------

28 years, 3 months

Calculator displays

by Philip.Belben＠powertech.co.uk

>>> By your later e-mail, you have that image form some website. Good, as it >>> would be almost impossible to make a reasonable ascii sketch of it. They >>> glow blue (what gas is that? argon?) and are viewed through a green filter. >> >> Is it a gas discharge or a fluorescent anode? The latter are often green/blue > > I think gas discharge, as they have the mesh anode that you referred to > in another message. Hmmm. I'm not convinced. IIRC, vacuum fluorescent displays have a hot wire cathode (thin, hard to spot) at the front, a mesh electrode near the back (anode?) and targets with greyish paint on them at the back. These targets usually glow blue-greenish when hit by electrons. But it is the paint that glows. Gas discharge has the cathode suspended in the gas, and it is the gas around it that glows, not the surface of the cathode. I have never seen a blue one, but I imagine argon is more likely than mercury vapour (which radiates mostly UV). Philip.

28 years, 3 months

Calculator displays

by Philip.Belben＠powertech.co.uk

>> It was also not the display I have in my other digital voltmeter >> (Dynamco, I think) which has as digits a multilayer Perspex sandwich. >> Each perspex layer has a dot pattern for a character drilled in it; you >> light up a character by illuminating the edge of the appropriate perspex >> wafer, and total internal reflection confines the light to that wafer, >> thus lighting up the dot pattern of only the one character. Neat. > > I've seem those used with a 2-colour (black, or illuminated red) > background for +ve or -ve results. Problem is, I can never remember if > red is +ve (as an engineer would use) or -ve (as an accountant would > use)... Actually, didn't Dynamco do that on some of their voltmeters? IIRC my Dynamco uses red for negative. Philip.

28 years, 3 months

question - how to test DMA on peecees right way?

by JRichardson＠softwright.co.uk

Hmm, did you say that you had checkit? I thought that did test the DMA controllers... maybe not, been a long time since I've used it... cheers Jules >

28 years, 3 months

TRS80 Model I Equipment

by gkatz001＠umaryland.edu

Alas, I have accepted a job offer that will take my family and me across the country into a home smaller than one we are currently renting. The Wife says that the Classic Computer Collection is NOT travelling with us. To be fair, if it DID move, I would have to store the equipment in a garage or something equally undesirable. The following equipment is in need of rescue: 3 TRS80 Model I CPU's two have keypads, one does not all are LEVEL II, 16K two have R/S lowercase mods, one has a non-R/S lc mod 2 Expansion Interface's both have 32K of RAM neither have functioning RS232 boards one has a buffered cable and SD controller one has non-buffered cable and R/S DD controller a single R/S RS232 board with a blown line driver chip might still be with us 4 R/S Shugart or Tandon Diskette Drives Two are Drive 0 designates with terminating resistors Two are Drive 1,2,3? without terminating resistors 1 VOXBOX - screws missing but functional at last test 1 TRS80 Voice Synthesizer - barely functioning at last test 1 TRS80 Line Printer 7 Box of Cassette-based tapes Unfortunately, three TRS80 Model I Monitors got tossed accidentally in a prior move, so I don't have any of these. The computers are currently located in central New Jersey. I am hoping that there is a local collector who would be interested in providing these guys with a loving home. I am currently located in Baltimore, so I can't ship them easily. Please reply via EMAIL if you are interested in retrieving these pieces of computing history. -Gary Katz

28 years, 3 months

VCF2 dates & venue

by sinasohn＠ricochet.net

At 01:18 AM 5/11/98 -0700, you wrote: > >Its now official...the Second Annual Vintage Computer Festival will be >held on September 26-27 at the Santa Clara Convention Center in Santa >Clara, California. On a similar note, there's going to be a World of Atari show in Las Vegas in August. Kinda like MacWorld, only for Atari's. (And much, much, bigger. 8^) Anyway, sounds like a lot of fun; unfortunately I won't be able to make it. However, the guy from Sacto said that if WoA is successful, he'll think about doing another Sacramento Atari Expo... So go, make it a big success... P.S., Sam, I forgot to mention that I'll be happy to bring over anything in my collection (except the big Symbolics machines or the HP3000 8^) to put on display, and I'll be after a table too, I think, to unload some of the Mac stuff Rachel's not using at school. Thanks! --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.sinasohn.com/

28 years, 3 months

PLease ID CD-ROM unit

by maxeskin＠hotmail.com

This card also has some RAM-like chips. IF one were to assume that those are buffers, could one say that this is just a customized parallel port card? >> single female socket,37 pin. It is labelled CD-IFI3, and has an NEC >> D8255AC-5 chip on it. It is a standard 8-bit ISA. Could someone tell > >It's not much help but I can tell you that an 8255 is a pretty dumb 24 >line parallel I/O chip. It has the interesting feature that any write to >the mode control register (even if it doesn't change it) sets all output >lines to logic 0. That can make life interesting... > > >-tony > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

28 years, 3 months

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