test-drb

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101090 discussions

by cctalk＠snarc.net

Friendly reminder that Vintage Computer Festival East XII is only 10 days away! March 31-April 2 in New Jersey. Two hands-on exhibit halls, a dozen tech talks, three keynotes, consignment sale, and you can visit the year-round Vintage Computer Federation museum while you're here. All the details are here: http://vcfed.org/wp/festivals/vintage-computer-festival-east/ ________________________________ Evan Koblentz, director Vintage Computer Federation a 501(c)3 educational non-profit evan at vcfed.org (646) 546-9999 www.vcfed.org facebook.com/vcfederation twitter.com/vcfederation

8 years, 10 months

Suggestions why SCSI 80 drive w/ SCSI2 (50) adapter will not spin up ?

by pete＠petelancashire.com

Host is a HP 9000/382 Copied the orig drive using a linux box, adaptec 2940N and good old dd Then swapped drives, a unused 9 GB 80 pin with a Chinese 80 to 50 adapter. Did have to issue a spin up command and then copied the data to this drive again with dd. Powered all off, added a motor start jumper to the adapter and put it on the 9000/382. Motor will not start, added a jumper right on the drive, no spin. so .. any ideas what I'm doing wrong, or just try a different drive ? -pete

8 years, 10 months

Timesharing/multiuser BASIC for MC68K

by jzatar2＠illinois.edu

I just wanted to share a little project I've been working on, it's an adaptation of Lee Davison's EhBASIC to become a timeshared multiuser BASIC. There's still a bit more to do, but here's a video of it in operation: https://youtu.be/SAJpHiBPMcQ In that video, it's only running 3 sessions (I had no convenient 4th terminal) but it's capable of running 4. It is a very very simple preemptive multitasking 'kernel' providing I/O services and performing periodic context switches for the instances of the interpreter. It only runs a fixed number of processes, and all the process memory is statically allocated. EhBASIC lends itself well to this, the code is position independent by design, and the memory range is passed in. Everything is dereferenced relative to the 'start of memory' pointer. This means no need for an MMU or relocation. I'm hoping to set this up at VCF MW in September, running 4 terminals. More info on the hardware I'm using is available here: https://hackaday.io/project/6150-beckman-du600-reverse-engineering Pictures: https://www.dropbox.com/sh/uw6cjqigk2sdwdy/AAAwP55aelyzrYeP1HVUDdMqa?dl=0 And another software project I'm working on as well (a ROM monitor program): https://github.com/jzatarski/Joe-Mon

8 years, 10 months

MUMPS in the news

by tshoppa＠wmata.com

http://www.politico.com/agenda/story/2017/03/vista-computer-history-va-cons…

8 years, 10 months

Introducing the UUCP/Usenet Project

by wkt＠tuhs.org

Camiel wrote: > What would the requirements for the system be? How often would it need to > be online? I added an answer here: https://github.com/DoctorWkt/4bsd-uucp#joining-the-growing-uucp-network For central sites (like decvax) that had a lot of connectivity, you will be expected to run them continuously. For edge sites which only dial in to one other site to exchange news and e-mail, you can run them whenever you want. It's mostly simulated sites right now, but I'd love to see some real systems come up and connect in. Not sure how to connect the simulated sites (using TCP for the dialup links) and the real sites. Cheers, Warren

8 years, 10 months

TRS-80 Model 1 Expansion Interface question?

by wheagy＠gmail.com

I have a clean, and somewhat functional expansion interface that I just tested over the weekend. Without the EI connected, the model 1 reports ~16K RAM and with the EI the model 1 reports ~48K, so the RAM seems OK. But, the FD1771 IC, for some reason, was removed from an otherwise apparently functional EI. http://imgur.com/a/3NzOh Is there any reason why this chip would be removed? I see a number of them on ebay for around $25. The expansion interface hardware manual indicates it is an FD1771B-01, but the service manual indicates a couple possibilities....FD1771 A/B -01 -11. Any considerations to look for here? Thanks, Win

8 years, 10 months

Looking for article: microprogrammed DIY TTL calculator

by jacek.greniger＠gmail.com

Hi, Two years ago I've found scans in PDF with the article (dated 197?, I don't remember) describing DIY TTL-based calculator. This was microprogrammed machine (if I remember correctly microproprogram was "stored" in the diode array). It has LED display and possiblity to calculate square root. Definitely not talking about EDUC-8 computer from 1975. I think this calculator was published a little bit earlier. Unfortunately I'm no longer able to find it. Does anyone associate the name of that magazine? Regards, Jacek

8 years, 10 months

Pair of Twiggys

by jnc＠mercury.lcs.mit.edu

> From: geneb >> When people decided Steve Jobs had become a god? > Right about the time that whole "computer for the rest of us" started... Yes, of course: nobody had thought of a cheap personal computer before him. (Which reminds me, does the CHM have a Datapoint 2200? If not, we really out to try to round one up for them.) Or even a personal computer. (Ditto for the LINC.) Although I suppose you might have been talking about the software. I mean, without that whole display/windows/menu/mouse thing he invented, to allow ordinary people to use a computer, where would we be? Look, I fully admit that Steve Jobs was a _very_ sharp person who had a _tremendous_ influence. (Every time I hear someone saying marketing people are useless - first up against the wall, etc - I reply 'No, only bad ones - which is a lot of them. The very best ones, like Steve Jobs, are worth their weight in triple-refined iridium. A _good_ marketing person can tell you what customers _want_. A _truly great_ one can tell you what they _need_, but don't yet even realize they do.') However, the people (and there are quite a few of them) who have gone way off the deep edge, and have turned him (and Apple) into some sort of overblown cult, just don't have a balanced perspective. There are plenty of people out there who deserve at least as much credit for the information society we now live in, who are almost totally unknown to the population at large; starting (probably) with Licklider. Noel

8 years, 10 months

Looking for cassete basic rom code

by alexandre.tabajara＠gmail.com

Dear friends Is it allowed to request a ROM code? I lost my XT BASIC ROMS, can someone send me the code so I can burn it and replace on my XT? Thanks! Alexandre ---

8 years, 10 months

Looking for cassete basic rom code

by billdegnan＠gmail.com

On Mar 19, 2017 12:47 PM, "Adam Sampson via cctalk" <cctalk at classiccmp.org> wrote: > > Alexandre Souza via cctalk <cctalk at classiccmp.org> writes: > > > I lost my XT BASIC ROMS, can someone send me the code so I can burn it > > and replace on my XT? > > minuszerodegrees.net has several versions of the XT ROM images, along > with lots of other useful service information for PC/XT/AT machines: > > http://www.minuszerodegrees.net/bios/bios.htm > > -- > Adam Sampson <ats at offog.org> <http://offog.org/> Has anyone made a ROM that runs BASIC and allows use of the disk drive to save on an IBM PC? This always bugged me that if you forgot to insert your dos disk before the computer powered up that one could not enter a basic command to tell the system to boot up from the drive without ctrl-alt-delete and wait....or to boot from the b drive, etc. Bill Degnan twitter: billdeg vintagecomputer.net

8 years, 10 months

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