test-drb June 1999

test-drb@ccmp.vtda.org

164 participants
610 discussions

Seen at an NC establishment closing down later this year

by jolminkh＠nsw.bigpond.net.au

Lawrence LeMay wrote: >> What should I do? Am I ever likely to find a use for them if I take them? >> > >Hmm, If they are DSDD and in an external case, i would like to have one >of those. Woudl you be willing to get one and ship it? I assume it >would be relatively easy to ship since you say the original packaging >is available. > Sorry, no external cases and I don't know what they are. These are specific to 220v 50hz. I thought S100 style machines had drives with 12v connectors.

25 years, 6 months

Formatting disk on rt11

by mbg＠world.std.com

>How can I format a rd54 disk on a rt11 5.3 ? You can't. >(disk & floppy are on RQDX3 controller) > >Doing something like > >.FORMAT DU0: > >i get "device not supported, ...) Yep, because the FORMAT code doesn't truly know how to format an RD series disk. The disks are formattable, but you must use the XXDP diagnostic ZRQC?? >P.S. Booting from DU1: works, so the controller & driver should be OK. >Trying accesses to DU0: I see the LED of the disk drive on. The drive can obviously be referenced, but won't be usable until you have it formatted. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

25 years, 6 months

Misusing the list - sorry (again).

by kstumpf＠unusual.on.ca

>...This could get confusing eh - two Kevins. > I guess I have fully demonstrated just how confused I was/am. I have just, once again, broadcast a private reply. Here I sit day after day saying "that was a silly message to broadcast, why did so-n-so waste my time by posting it? it should have been a private message, blah, blah, blah,..." and so I go and do the same thing. My apologies, but, oh what the heck...would so-n-so please use better judgement deciding what should be broadcast and what should be private messages. Thank you ---------------------------------------------------------------------------- ------------------------------- Kevin Stumpf * Unusual systems * www.unusual.on.ca +1.519.744.2900 * EST/EDT GMT - 5 Collector - Commercial Mainframes & Minicomputers from the 50s, 60s, & 70s and control panels and consoles. Author & Publisher - A Guide to Collecting Computers & Computer Collectibles * ISBN 0-9684244-0-6 .

25 years, 6 months

Formatting disk on rt11

by emu＠ecubics.com

Hi all, How can I format a rd54 disk on a rt11 5.3 ? (disk & floppy are on RQDX3 controller) Doing something like .FORMAT DU0: i get "device not supported, ...) Any help ? thanks, emanuel P.S. Booting from DU1: works, so the controller & driver should be OK. Trying accesses to DU0: I see the LED of the disk drive on.

25 years, 6 months

Northstar Horizon

by fmc＠reanimators.org

"Fred Cisin (XenoSoft)" <cisin(a)xenosoft.com> wrote: > Any good sources for routine and/or user information about the Horizon? > f'rinstance: what's the pinout on those 15 pin D "parallel" connectors? > Any chance the signals are close enough to be cabled into a centronics > style port? I haven't applied power to it yet; anything exceptional to > watch out for? Yeah. Fire. I'm only half joking: Stan Sieler and I have had about the same experience, which is that one of the tantalum caps near a voltage regulator (connected between +mumble and ground on the input leg of the regulator) turns into a noise, fire, and magic soot emitting diode on first application of power to the card(s). As near as I can tell, the cap shorts to protect the regulator from voltage, but I'm a software weenie with a soldering iron so what do I know? So leave the cover off after you re-insert the cards (you're going to pull them to check the power supply voltages, right?), for that matter make sure you leave some space between the cards when you put them back in, and be ready to hit the switch. ObTony: this problem is amenable to component-level repair. Clean the soot off and replace the capacitor. -Frank McConnell

25 years, 6 months

DEC 11/45 FS.

by kstumpf＠unusual.on.ca

This could get confusing eh - two Kevins. How long have you been on the CCL? I'm delighted to know another collector in Kitchener. That's wonderful. That makes 3 who will admit it. Why don't you come to my "ware"house and see it. How about tomorrow at either 10am or 1:30pm. It is easy to get to being near the corner of King and Victoria. Yours in good faith. ---------------------------------------------------------------------------- ------------------------------- Kevin Stumpf * Unusual systems * www.unusual.on.ca +1.519.744.2900 * EST/EDT GMT - 5 Collector - Commercial Mainframes & Minicomputers from the 50s, 60s, & 70s and control panels and consoles. Author & Publisher - A Guide to Collecting Computers & Computer Collectibles * ISBN 0-9684244-0-6 .

25 years, 6 months

Bubble memory markings

by ds_spenc＠alcor.concordia.ca

Hi, Does anyone know what all the numbers on the backs of Intel Magnetics bubble memory modules mean? One of the three modules that I have has a penciled-in line separating every 4th digit, so it looks like maybe some kind of address, but I think the modules each store 128KB and 16 bits wouldn't be enough. Besides that, I can't think of any use for address listings on the modules. e.g.: 09FHJ 8333 (<-- probably a date code) FFF7BAFBFFFBFEBF 7BB3FFFBFEFBFBFE FBFF7BF3DDBFDFBF BFFFFFFDFDFFFFFF DFFDFFFFFFBFFDFF -- Doug Spence ds_spenc(a)alcor.concordia.ca http://alcor.concordia.ca/~ds_spenc/

25 years, 6 months

at style keyboards and mc68000

by edick＠idcomm.com

With the aid of a dedicated processor, this job is easy. Since the work is already done, I can send you a zip file of the details and the required code. Dick -----Original Message----- From: John Ott <jott(a)mastif.ee.nd.edu> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Friday, June 04, 1999 11:23 AM Subject: Re: at style keyboards and mc68000 >Hello - > >I would be interested in seeing this. > >john > >> >> Hi, >> >> ---------- >> > From: Tony Duell <ard(a)p850ug1.demon.co.uk> >> > To: Discussion re-collecting of classic computers >> <classiccmp(a)u.washington.edu> >> > Subject: Re: homemade computer for fun and experience... >> > Date: Sunday, April 04, 1999 10:49 AM >> >> > True. But AFAIK the AT keyboard host interface was never implemented in >> > TTL (it always used a programmed 8042 microcontroller), so it's a little >> > harder to build from scratch. >> >> We used on our mc68000 boards a 68681 DUART & and some inverters as a >> keyboard interface for xt/at. Was very simple. If anybody needs it, i could >> dig it out again. >> >> cheers, >> emanuel >> > > >-- > >*********************************************************************** >* John Ott * Email: jott(a)saturn.ee.nd.edu * >* Dept. Electrical Engineering * * >* 275 Fitzpatrick Hall * * >* University of Notre Dame * Phone: (219) 631-7752 * >* Notre Dame, IN 46556 USA * * >*********************************************************************** >

25 years, 6 months

homemade computer for fun and experience...

by emu＠ecubics.com

Hi, ---------- > From: Tony Duell <ard(a)p850ug1.demon.co.uk> > To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> > Subject: Re: homemade computer for fun and experience... > Date: Sunday, April 04, 1999 10:49 AM > True. But AFAIK the AT keyboard host interface was never implemented in > TTL (it always used a programmed 8042 microcontroller), so it's a little > harder to build from scratch. We used on our mc68000 boards a 68681 DUART & and some inverters as a keyboard interface for xt/at. Was very simple. If anybody needs it, i could dig it out again. cheers, emanuel

25 years, 6 months

Space, the next frontier

by allisonp＠world.std.com

<I used 5/8" plywood and 2x4 all around mounted vertically for extra <support for the shelves. I would not use anything less. Try sticking a <couple S-100 chassis on a shelf of 1/2" plywood or supported with less Err... I've done it and 1x2 and 1/2" play do it real well and I do have a few s100 crates. <than a 2x4 and unless you have additional support in the way of diagonal <cross-members or extra support underneath the shelf it'll bow or break. <Maybe not right away, but with time it'll start to sag. the trick is you box the underside of the shelf in 1x2 and put one down the middle for support. then that assembley is screwed to a 2x4 at the corner and a pair of diagonal braces on the back of 1x2 and side if needed. Use wallboard screws to assemble rather than nails, they hold better. <It saves much time to use steel brackets instead of cutting slots into the <wood. I did my first shelf with the latter design and it took a long What slots? It can be sone that way but it's not a required thing. <If I had to do it over I'd buy pre-fab shelves like the Gorilla racks. They are nice and all but the wood can be cheaper especially if you can scrounge. Also wood can be configured for odd sizes like a 27" wide space between the h960 and the window. ;) Allison

25 years, 6 months

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test-drb June 1999