test-drb December 2004

test-drb@ccmp.vtda.org

243 participants
530 discussions

ZX81 denigrated! (was Re: Approaches to projects)

by pete＠dunnington.u-net.com

On Nov 29 2004, 0:18, Tony Duell wrote: > Pete Turnbull wrote: > > Sounds like mine. The one I have is a replacement, but almost > > identical to the one my Dad bought in the mid-60s. It's about 115mm > > wide x 55mm thick x 200mm long; it has three DIN sockets on the > > > panel. It takes five C-size cells. It originally came with a slightly > > Yes. You could also feed in 7.5V through one of the sockets -- it was a > '240 degree' DIN socket used for external power, remote control, and > monitoring earphone. One thing I must do is make a little adapter with a > power connector and a remote control socket wired to a suitable plug. That's the one. I use that for power and remote from the Beeb. > Ah, I was wondering if it would work with a Beeb... Mine alsoe needs new > drive belts, but otherwise is still operational. I have the schematic > from the appropriate year of 'Radio and Television Servicing', although > sometimes oen was folded up inside the machine anyway. I had to replace the drive belt in mine a few years back. I got a belt >from CPC for a few pence. -- Pete Peter Turnbull Network Manager University of York

19 years, 7 months

Reseating QFP-socketed chips

by julesrichardsonuk＠yahoo.co.uk

Anyone else find that QFP-socketed chips in late 80's / early 90's equipment are *really* prone to corroding and needing re-seating? I've just had to re-seat several on this NCR Tower which were the cause of all sorts of problems - yet I don't normally find that DIL chips need any re-seating on equipment of this sort of age. (I *think* QFP's the proper name - commonly used for 80186 / 80188 / 80286 chips, which have flat leads underneath the device) Anyway, I now have a working NCR machine that chucks out more heat than a small furnace and makes the lights go dim :-) (well, almost!) cheers Jules

19 years, 7 months

Reseating QFP-socketed chips

by dwight.elvey＠amd.com

>From: "Jules Richardson" <julesrichardsonuk(a)yahoo.co.uk> > > >Anyone else find that QFP-socketed chips in late 80's / early 90's >equipment are *really* prone to corroding and needing re-seating? > >I've just had to re-seat several on this NCR Tower which were the cause >of all sorts of problems - yet I don't normally find that DIL chips need >any re-seating on equipment of this sort of age. > >(I *think* QFP's the proper name - commonly used for 80186 / 80188 / >80286 chips, which have flat leads underneath the device) > >Anyway, I now have a working NCR machine that chucks out more heat than >a small furnace and makes the lights go dim :-) (well, almost!) > >cheers > >Jules > > Hi As usual, I will note here the virtues of using DC#4 silicon grease on the contacts to improve conductivity and hold off corrosion. Dwight

19 years, 7 months

Mecos device

by awatt＠grandriver.ca

Hi Lawrence, I know your post about the little electronic MECOS device you found in a box of junk is 2 years old, but do you still have it? A friend's father-in-law has such a thing that he's been wearing around his neck and swears it keeps him healthy. (We're not sure how.) It's wearing out and he wants a new one. If yours is still working, would you be willing to part with it? Alison

19 years, 7 months

ARS33 ? motor on eBay

by jpl15＠panix.com

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=71400&item=385749145… Teletype model 402402 dual speed - 1 day left, no bids - starts at .99 Cheers John

19 years, 7 months

class X supression caps

by julesrichardsonuk＠yahoo.co.uk

A lot of class X1 supression caps seem to be self-destructing in vintage equipment these days. I've got one in my NCR needing replacement, plus we have an HP 3000, two Apple Lisas and an Apple /// all needing them too... (they don't half smoke when they let go too :) Looking around, it seems that everywhere these days sells class X2 caps, and Y2(X1) caps. What's the modern-day replacement for a dead X1 cap? X2, Y2(X1), or something else entirely? I'm sure I've seen Y2 caps in old equipment as being a different thing to X1, which is why I'm getting confused if they're now classed as the same! (Anyone have a source for 0.68uF X1 caps in the UK? Seems to be a very uncommon value for supression caps - everyone does 0.47uF and then 1uF) ta Jules

19 years, 7 months

Intel ISPC/2 on eBay, ship or local pickup in Springfield, MO

by wmaddox＠pacbell.net

This looks like a cool toy. And in my own (former) hometown, even... http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5144666359&ssPageNa… eBay item 5144666359 (Ends Dec-08-04 17:27:12 PST) - Vintage Intel IPSC/2 Concurrent Computer System UMR --Bill

19 years, 7 months

Auction: Acclaim Entertainment, Inc.

by tothwolf＠concentric.net

I guess this confirms the rumor of Acclaim going belly up... I just received an auction notification for Acclaim Entertainment in Austin, Texas. I don't know if there will be any classiccmp related bits for sale, but I thought at the very least folks here would want to know about it. Inspection/Preview is Dec 13th, and the auction is on the 14th and 15th. This looks like a huge auction compared to some of the large foreclosure auctions I've been to in Texas. See http://www.flsauction.com/ and http://www.shattuck.com/ for more info. -Toth

19 years, 7 months

Making CP/M disk images

by GFisher＠tristonecapital.com

I'm trying to do the same thing with some (downloaded) Teledisk images for an Altos 580 server which has a similar 96tpi floppy with no luck (a plea for help here). My limited understanding is that these drives use double density media and that a standard 1.2 mb drives don't work too well with that (the manuals all say that writing out 360k AKA 40 track disks on a 1.2mb is a bad thing). Did you take the drive in the SB180 and put it in the Compaq, still calling it a 1.2, 360k or even a 720k 3.5? I tried that with a different (SA-465) 96tpi drive jumpered as drive 1 and it seemed to write disks with no reported problems on the Teledisk write. The Altos still didn't like the disk though but that might be a function of the original files (or something else I forgot to do). Gary F. ------Oiginal below edited for brevity.----- Message: 6 Date: Wed, 24 Nov 2004 19:48:18 -0500 From: "Richard A. Cini" <rcini(a)optonline.net> Subject: RE: Making CP/M disk images To: "'Dwight K. Elvey'" <dwight.elvey(a)amd.com>, "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk(a)classiccmp.org> Message-ID: <000801c4d288$74daad50$6501a8c0@bbrk0oksry5qza> Content-Type: text/plain; charset=us-ascii Dwight: Interestingly, Teledisk did skip every other track. These are DSDD disks formatted on the SB180 machine using the "40 track" option. The drive in the SB180 is a 96TPI drive (HD) and the disk on the PC side is a standard 1.2mb. I'll have to see if Teledisk has any options that may address this. As I recall, the number of configurable options was sparse, though. This e-mail and any attachments may contain confidential and privileged information. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this e-mail and destroy any copies. Any dissemination or use of this information by a person other than the intended recipient is unauthorized and may be illegal. Unless otherwise stated, opinions expressed in this e-mail are those of the author and are not endorsed by the author's employer.

19 years, 7 months

RT-11 installation

by dbetz＠xlisper.mv.com

I'm finally getting around to trying to do something with my PDP-11/23 system and am having trouble creating bootable RT-11 V5 disks. I have an RX02 drive and a set of RX01 distribution disks. I've tried booting disk 1 of the RX01 distribution and that fails. Should I be able to boot an RX01 on an RX02 drive? Also, I've tried copying disks using: COPY/WAIT/OUTPUT:DY1: DY0: and then COPY/BOOT DY1:RT11FB.SYS DY1: Unfortunately, that doesn't result in a bootable disk. In fact, when I did it, it trashed the system disk in DY0 even though I removed it before and replaced it with the source disk of the copy. Does this sound like I've got a broken drive? I seem to be able to read either RX01 disks or RX02 disks in DY1 without any problem. Also, the copy I made in the first step above seems to be okay. It's just that I can't boot the disk after the second COPY/BOOT step. What dumb thing am I doing wrong? Thanks, David Betz

19 years, 7 months

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test-drb December 2004