test-drb

test-drb@ccmp.vtda.org

101090 discussions

by jfoust＠threedee.com

A Brief, Incomplete, and Mostly Wrong History of Programming Languages http://james-iry.blogspot.com/2009/05/brief-incomplete-and-mostly-wrong.html - John

15 years, 11 months

Commodore C2N tape drive belt replacement?

by Hollandia＠ccountry.net

Mr. Dicks, Failing a replacement BELT, here is something else that you might try. I have no idea how well it would work. Ordinary automotive oil seals have within them a garter spring, that goes around the lip of the seal and provides some pressure on the sealing surface. These springs are easy to find: they are on the outside of the lip (usually) hidden behind a small flap of rubber. Push this flap toward the radial center of the seal and you can see the spring. It is simple to extract with a fingernail. If you need to thread the spring through something to get it on the pulleys, the spring has a conical end that threads into a square-cut end. Naturally the spring has elasticity; I don't know if this will defeat its purpose or not. If a belt cannot be obtained, you might try this. Kurt >Hi, All, > >I've been fiddling with PETs lately and have found to my dismay that >my original c. 1978 C2N just doesn't push the tape along as fast as it should. >I opened it up, cleaned some minor funk out of the innards, but the old drive >belt is just a little sloppy and has a kink on it where it sat around the motor >pulley for a number of years between uses. The symptom is that FF and REW >speeds are not uniform, there's no real "grab" when pulling on the belt or >manually spinning different pulleys, and there is visible slackness in the >belt. Loads are spotty, and they mostly fail. The "secret" trick of >holding down >the ">" key when the tape is moving does show that the CPU sees flux >transitions, but it fails to recognize what's on the tape(s) as valid data most >of the time. I know the tapes are good, and a slipping belt explains all the >observed symptoms. > >It's an easy enough part to replace, but does anyone know where to >get a proper replacement from? It's a continuous rubber belt, with a >square cross-section just under 1mm on a side, probably about 250mm- >300mm long, give or take a bit (I didn't measure it). It looks entirely >ordinary in the context of 1970s cassette transports. > >Thanks, > >

15 years, 11 months

IBM System 360 Model 91 operator console from 1969

by d.house＠computer.org

I will be moving and may need to place it in a new home. It is huge: 6x4x2 feet with over 2100 lights. Currently in Raleigh, NC, USA. Serious inquiries only please. Kind Regards, Daniel

15 years, 11 months

Teaching(Was: Lisa C and Lisa FORTRAN

by trag＠io.com

> Date: Mon, 10 May 2010 12:12:26 -0700 (PDT) > From: Fred Cisin <cisin at xenosoft.com> > I used to be able to get K&R past them by calling it "a classic work", and > by declaring it to be one of two texts for the class (the other being some > modern POS that we never bothered to open) > > For a FIRST class in C, the commonly used textbooks are Deitel (600p, of > which 300 are about C, plus discussion of C++, Java, etc.), and "C Primer > Plus". Both are pretty good for beginners, but neither prepares the > student for what will happen when scanf is fed unformatted/sloppy data. The clearest C book for beginners that I've read was "C: Step-by-Step" by Waite & Prata. It actually teaches the material, rather than just throwing it on the floor and hoping the student will pick it up. Supplemented by K&R it made an excellent teaching vehicle. My opinion and obviously different folks learn in different manners, but I felt that Waite & Prata filled in the holes better and left fewer unexplained assumptions than other works that I have seen. And it won't give one back problems the way Deitel will. Jeff Walther

15 years, 11 months

VSV21-AA (M7656) Qbus graphics card

by bqt＠softjar.se

Richard <legalize at xmission.com> wrote: > Can anyone tell me about this product? I found it in the module list > described as follows: > > M7656 VSV21-AA Q Colour graphics module: M68K processor, HD63486 > M7656 video processor (512x512 or 512x256 resolution), > M7656 Serial ports for mouse, trackball, console and > M7656 LK201. > > I'm interested in knowing what software products support this. For > instance, if I put this card in a Qbus VAXserver 4000/300, will it > enable me to run DECwindows locally? No, since there is no X server written that can use the VSV21. There is a device driver, and a library with various functions available for both VMS and RSX. The graphic card can actually run in a couple of other resolutions as well. I have mine set at 640x480. Johnny

15 years, 11 months

new acquisitions

by chrism3667＠yahoo.com

IBM 7374 plotter. Missing the damned carousel. Haven't plugged it in yet, so not even sure it's functional. Something tells me, being it's an IBM, spare circuit parts, as needed, will be the least of my worries. If anyone has a junker and would let me scrounge a few items from it, I'll remember them in my prayers. Promise :). Besides pay reasonable costs + shipping. Jameco eprom/gal/pal/?/?/?. 6502 based (primarily at least). Non-functional. BUT OF COURSE. I'm not terribly worried, being I've also obtained - Tektronix 5440 scope. Already have a 2216. So the combined might of these 2 monsters of engineering will undoubtedly aid in the recuperation of the previous item. There were more then a few chips w/stickers on top, so that tells me they're likely custom logic, so I'll need some of that epoxy dissolver in additon. Or a die-grinder and a steady hand. Right? I happen to have a probe I picked up from somewhere in my garbage garage. The inputs on these 2 scopes require 1Mohm wit either 22pF or 47 pF of capacitance. What does this mean? There's simply a capacitor between the coax? The resistance part is strait forward presumably. If that's the case, then you can just jury rig an acceptable probe, no? Also picked up a big huge square HP monitor. Don't know the part # offhand, but has a datecode of 1984. First time I've seen one of these. And I've seen a lot of monitors. I'm sure I'm hoping in vain that it takes digital rgb. I also need help w/G4 Macs and Sun workstations and servers. But that's offtopic and I can look up most of that online. Just in case anyone wanted to chat about it. Offlist of course... Anyone w/any HP-UX stuff they no longer need?

15 years, 11 months

Radio Shack Science Fair manuals

by jgessling＠yahoo.com

I don't have that exact model but I've got a NIB 28-262 Science Fair 200 in 1 set. Box is beat up but inside it looks like it's never been used. Has a manual and loose parts. Not sure all the loose parts are there, there are several bundles of different length wires (never unwrapped) and a single ear phone. Maybe I can talk you into taking the whole thing. Regards, Jim

15 years, 11 months

Anyone Have Knowledge or Experience on IBM SERIES/1

by billdeg＠degnanco.com

Trebor/Curt, I have an IBM System 1 in my office in Wilmington, Delaware. It was pulled >from production in working order but I have no idea how to get it running. I have a lot of the same components you've described. I worked with an ex-IBM tech for about three hours to do a system inventory and figure out what conntects to what, but that's about as far as we got. I would love some help if anyone is in the MidAtlantic USA area and knows the Series 1 hardware. http://vintagecomputer.net/ibm/Series1/ Bill > > Message: 6 > Date: Mon, 10 May 2010 10:21:32 -0400 > From: "Curt @ Atari Museum" <curt at atarimuseum.com> > Subject: Re: Anyone Have Knowledge or Experience on IBM SERIES/1 > To: General Discussion: On-Topic and Off-Topic Posts > <cctalk at classiccmp.org> > Message-ID: <4BE8166C.2020300 at atarimuseum.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Wow, Bob I wish I could help you out. I installed one at Moody's > Investment back around 95-96' or so... I used to have all the technical > manuals and such, its been so damned long, I think I'd be as lost as you > are in trying to get the beastie up and running - gorgeous machines > though, very nice design. > > > Curt > > > > trebor77 at execpc.com wrote: > > I am looking for anyone who has Knowledge or Experience on IBM SERIES/1. I > > have a System in my Basement that hasn't been run for 18 Years. Not sure > > it can be Started up. Its a 4952 Half Rack with a 4955E replacing the > > 4952. Has a 9Meg HD Got an External Floppy. Got a 4978, a 3101, TTY Card. > > I used to Program in EDL on it back in the late 80's early 90's > > Bob > > in Wisconsin > > > > > >

15 years, 11 months

Anyone Have Knowledge or Experience on IBM SERIES/1

by trebor77＠execpc.com

I am looking for anyone who has Knowledge or Experience on IBM SERIES/1. I have a System in my Basement that hasn't been run for 18 Years. Not sure it can be Started up. Its a 4952 Half Rack with a 4955E replacing the 4952. Has a 9Meg HD Got an External Floppy. Got a 4978, a 3101, TTY Card. I used to Program in EDL on it back in the late 80's early 90's Bob in Wisconsin

15 years, 11 months

Equipment Reduction

by melamy＠earthlink.net

I have found myself needing to reduce the area consumed by the systems I have. The list below is what I need to let go of. Send me an email off list if you are interested in making an offer or if you have specific questions - sthatcher @ melamy.com. Local to Kenmore, WA 98028 is better because of shipping costs for some of the items, but I will work with you. Due to age (mine and the equipment), I can make no guarantee that they work or how long they will work if they do - typical old equipment caveats... Best regards, Steve Thatcher 1 - Intel MDS 220 development system (single dd 8" floppy, 8085 processor, 64K memory, operating system on disk). Worked the last time I powered it on (a few years ago). 1 - Intel dual dd floppy drive cabinet (comes with cable that I was building to connect it to the main system) 1 - Intel MDS 210 cabinet (no electronics and no front panel) 1 - Intel iPDS development system (I seem to recall a intermittent power supply issue). 1 - Intel iPDS expansion floppy drive (worked last time I powered it on) 1 - Davidge cpm system (64K, z80, 20 meg hd, 3 1/2" floppy drive - not sure about density) with floppy drive cabinet (one dd 8" floppy drive). Worked the last time I powered it on (a few years ago). 1 - Kaypro 4 in good condition (will have to check functionality). Has OS disk. 1 - Kaypro 10 in good condition (with have to check functionality). Has OS disk also. 1 - Kaypro 2X in good condition (will have to check functionality). Has OS disk. 1 - Prolog 8085 System Analyzer (with pod and manual) 1 - Osborne 1 system with external CRT monitor there is more, I will be adding to this list as I have time.

15 years, 11 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb