test-drb October 2005

test-drb@ccmp.vtda.org

264 participants
655 discussions

by RCamarda＠aol.com

Hi Joe, I was wondering if you ever found the MCB-216 roms, or source code for the Cromemco SCC board. I am also looking for them. Let me know if you can help. Thanks! Rich

18 years, 9 months

HP 7970 power supplies available

by jwest＠classiccmp.org

Not sure if I posted these before or not, sorry if it's a repeat. I have a fair number of HP 7970E and 7970B power supplies available (about 10 or 15). I keep meaning to take them to the dump but just haven't made it yet. If anyone wants one (or two or three) let me know ASAP. Jay West

18 years, 9 months

Looking for RL02 cable and terminator

by pete＠dunnington.plus.com

On Oct 17 2005, 0:39, Ethan Dicks wrote: > On 10/16/05, Pete Turnbull <pete at dunnington.plus.com> wrote: > > RL01 and RL02 cables have those funny connectors at both ends. > > Drive-to-drive cables certainly all do, and _most_ interface-to-drive > cables do, but some do not. > > In particular, I have seen a 40-pin-Berg-to-RL-drive cable (no ribbon > cable whatsoever) > in two situations; with an RLV12 in a MicroVAX-II, and my own RL8A. The RLV12 comes with a cabinet kit as I described. Sounds like yours is unusual. I suppose it's possible, even likely, that DEC didn't do that for the RL8A, but they certainly made cabinet kits consisting of a short ribbon cable with a Berg connector and transition connector on a plate for RL11, RLV11, and RLV12. > > It sounds like you haven't got the ribbon cable for the interface end > > either; that would be a short 40-way ribbon with a Berg connector on > > each end with one of the opposite-gender funny RL0x connectors plugged > > into one of the Bergs. > > The rig I think you are describing was typical of the RL11, for example, with > a 40-pin ribbon cable to a black connector mounted in a mountable metal frame > that accepted a drive-to-drive cable. Yes, but also for RLV11 and RLV12. I've never seen one without that. > That black transition connector, BTW, is > identical to the transition connectors on the back of the disk drive > units. Worst > case, you can steal/borrow one from a scrap drive. Indeed. -- Pete Peter Turnbull Network Manager University of York

18 years, 9 months

Friden EC-130 calculator schematics?

by brian＠quarterbyte.com

Hi This is a bit off-topic, since the device isn't programmable, but... does anyone have a set of schematics and/or a service manual for the Friden EC-130 electronic calulator? Google isn't coming up with anything but others' requests for the same. Thanks Brian

18 years, 9 months

Compute magazine

by holger.veit＠ais.fraunhofer.de

Hi, for quite some time I have some magazines of COMPUTE ("Club Of Microprocessor Programmers, Users and Technical Experts"), a gazette sponsored by National Semiconductor, lying around which I consider worthwhile to be conserved for the past. The date I am talking about is around 1975..1977. Some questions: 1. I have only some issues, namely V2N7...V2N12, V3N4...V3N7. Does anyone have other issues (and is willing to scan or copy those)? I'd be very interested in this epoch. 2. Scanning: You find a sample issue at http://www.ais.fraunhofer.de/~veit/v2n7.pdf (2MB). This was scanned B&W 400dpi, stored as TIF and converted with Acrobat. My problem is that even with this some listing pages are barely readable, see page 3 for example. This is probably because of lack of contrast; the magazine is printed on light brown paper with dark brown text. If one scans in color with 600dpi (as in sample http://www.ais.fraunhofer.de/~veit/3x.pdf, 2MB) this will result in much larger files - the raw TIF is 95MB on my disk, which is not a diskspace issue for me, but for downloaders; expect a single issue to be 40MB and more in size. Do the "professional scanners" here, like Al, have a recommendation for resolving this? Regards Holger

18 years, 9 months

Public Service Announcement: AVOID "bobsbid1"

by ajp166＠bellatlantic.net

> >Subject: Re: Public Service Announcement: AVOID "bobsbid1" > From: Gordon JC Pearce <gordonjcp at gjcp.net> > Date: Sun, 16 Oct 2005 14:36:25 +0100 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >woodelf wrote: > >> But I think the reason the cable makes a difference is you got all the feed >> back in a transistor amp ( less in a valve ) and any noise on the speaker >> cables like ac hum? and other noise will get fed back to the amp > >What *exactly* do you live near that couples that much mains hum into >speaker leads? Consider that the leads have very little inductance, and >are shunted with a very low impedance load... > >Gordon. It's that oxygen free copper its so pure it hears galactic noise. Gag! Magnetic hum is square law, unless one of the speaker wires are wrapped around the power line I'm sorry it ain't there. Besides paired wires are naturally resistant. Every time I hears this stuff I do an eye roll. Allison

18 years, 9 months

OS/2 vs Win3.1

by ajp166＠bellatlantic.net

> >Subject: OS/2 vs Win3.1 > From: Bert Thomas <bert at brothom.nl> > Date: Sat, 15 Oct 2005 09:15:19 +0100 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Allison wrote: >> How does OS/2 warp V3 compare to other PC OSs like CDR Concurrnet386 or >> win3.1? > >I don't know anything about Concurrent386, but comparing OS/2 Warp with >win 3.1 is like comparing pigs with streetlights. > >Win3.1 is a graphical shell around DOS. To overcome DOS' memory >limitations is uses some more advanced techniques of the processor, such >as protected mode. However, win3.1 programs are 16-bit. Win3.1 itself is >16 bit. Win 3.1 only allows cooperative multitasking. That means that a >another program can only get control if the running program gives it up. >This is a very short summery of Win3.1 > >OS/2 2.0 and higher are 32-bit operating systems. However, compatibility >with older OS/2 applications was considered very important and therefore >parts of the kernel and all device drivers are mainly 16 bit. Only >recently some 32-bit device drivers were written. > >OS/2 has its own graphical subsystem - a very advanced one. It can run >DOS programs in 'virtual dos machines' or VDM. A special mode of the 386 >processor allows a task to act as if it where a real mode task. Anything >that task does can trap the processor and thus can be handled by >exception handlers. OS/2 is very strong is this area. > >OS/2 has its own file system with some special features like "extended >attributes". > >OS/2 has dynamic priorities for tasks, that makes it more responsive. >For example, a task that has focus in the GUI is slightly raised in >priority. Or when a background task was blocking for something it might >receive a slight priority boost when that something becomes available. > >OS/2's time critical priority is handled "soft realtime". I've used OS/2 >in the past for process control, dosing in particular. For such >applications realtime behaviour is very important as a lattency of 1 sec >or more is disasterous for the product being manufactered. > >I can go on and on, but if you want to know more let me know and I write >it down later on. > >Regards, >Bert Thankyou for the informative comparison. I know 3.1 was 16 bit, I really didn't bother bringing W9x up and Concurrent386 was the other. Concurrent is interesting as the copy I have is a 10 user license. I fully read everything but it appears to support multiple users on one system as a time sharing and task sharing alternative to DOS. I susuect it's also 32bit or has some core task controls as 32bit code. Allison

18 years, 9 months

Looking for RL02 cable and terminator

by James＠jdfogg.com

> Now that my 8/A is up and running it's time to hook up the > RL02. I do have the interface board plugged into the Omnibus, > the correct boot ROMs on the option board, and the RL02 has > the Unit "0" plug but no cable or terminator. I could make my > own if someone can tell me where to get the connectors that > fit the drive end. Are you anywhere near Northern New England?

18 years, 9 months

Releasing OS/2

by vp＠cs.drexel.edu

ard at p850ug1.demon.co.uk (Tony Duell) wrote: > There were certauinly : > > Transputer (both all-on-one cards (host adapater + transputer + RAM) and > TRAM motherboards) > [...] IBM had even produced a 370 as a set of adapter cards for the original PC. The package was called PC/370. The processor(s?) were 68000s with IBM microcode. AFAIK they used more than one, but I am not sure how many. **vp

18 years, 9 months

Radio Shack TRS-80 Models I and III available near NE Ohio

by vcf＠siconic.com

See below. Contact original sender directly. Reply-to: Kirk Worcester <kirk at neo.rr.com> ---------- Forwarded message ---------- Date: Mon, 19 Sep 2005 14:35:32 -0400 From: Kirk Worcester <kirk at neo.rr.com> To: vcf at vintage.org Subject: Radio Shack I have a RS Model I and Model III and I'm looking for a good home. Any suggestions? Ideally I'd like to find a local collector (NE Ohio) that could come and pick these up. Thank you, Kirk Worcester -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

18 years, 9 months

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test-drb October 2005