test-drb

test-drb@ccmp.vtda.org

101090 discussions

Information still needed for Infotron IF/65 Development System II for 65XX microprocessors and CUBIT EPROM Programming board - AIM-65 or KIM ?

by whdawson＠mlynk.com

Hello to all, I'm still looking for information for these items: Firstly, an Infotron IF/65 Development System II. It appears to connect via RS-232 to a dumb terminal for its output of such things as address and data, and perhaps input of some parameters such as uP clock rate; baud rate is selectable from a thumbwheel. This system also appears to have the capability of single stepping the program contained in the device in the ZIF. It has a 28 pin ZIF socket for the targets EPROM/PROM/ROM. There is a standard ribbon cable that connects to a pod, and the pod has a braided ribbon cable that terminates at a 40 pin dip header, most likely to attach to the target in place of the uP. Trap conditions are selectable via four 0 to F thumbwheels, and conditions to be triggered on can be selected as memory data read, memory data written, and/or op-code. Any information would be greatly appreciated, a source of a manual or instructions for use would be fantastic. This equipment can be viewed at http://www.wpic.com/whdawson/Pics/infotron.gif and secondly: A CUBIT EPROM programming board for the AIM-65. It is not an RM65 board, the connector will plug right onto the expansion connector on an AIM, but can also be attached with an appropriate 1-to-1 ribbon cable. Here is the description: Measures 4-7/16 (4.4375)inches wide by 6-1/2 (6.5) inches long, including edge connector, lengthwise insertion. 44 pin gold plated edge connector with a 44 pin socket mounted immediately behind and parallel to the edge connector, on the component side of the PCB. 24 pin ZIF connector in the upper LH corner, viewing with the edge connector facing me (all descriptions below assume this position). 10 position DIP switch immediately to the right of the ZIF socket (no labeling), and another 10 position dip switch about halfway up the RHS, labeled 1 to 7 and B, C, D (probably address selection since one row of pins is all tied common and most of the pins on the other side of it go to a 74LS154). One LED, immediately to the right of the first 10 position DIP switch mentioned above, at the edge of the board. Two trimpots about center of the far edge of the board, to the right of the LED. Two jumper blocks, one with 2 pins, labeled W1, and one with 3 pins, labeled RO and RA. Two Toshiba 24 pin TMM2016P-1 RAMs left of center in second row of DIPs on the board. One 2516-45 EPROM to the left of the RAMS, with a label on top "6517A". On the solder side the only markings (in etch) are CUBIT INC, 1981 and the numbers 10362 and 6583. Most of the date codes on the ICs are between 8037 and 8203. There is no other model number, manufacturer, or other ID marking on this board. This programmer can be viewed at http://www.wpic.com/whdawson/Pics/cubit.jpg Thanks, Bill whdawson(a)mlynk.com

26 years, 2 months

Diode help... HELP!

by apple＠cmc.net

Germanium diodes have the least amount of voltage drop while conducting (about .06 volts I think) and a popular one that should be readily available is the 1N34 or 1N34A. The reason that diodes seem to act funny on an ohmmeter is because of the fwd voltage drop while conducting. The silicon diodes that you probably got at radio shack have a fwd drop of more than .5 volts and will appear as a high resistance to your meter even though they are conducting. Hope this helps Noble -----Original Message----- From: Bill Sudbrink <bill(a)chipware.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Tuesday, February 22, 2000 1:44 PM Subject: Diode help... HELP! >Hi, > >Once again demonstrating my vast quantities of ignorance... >I need a diode which completely blocks current in one direction >and presents as little resistance in the other direction >as possible. I bought a fist full of little glass ones at >Radio Shack for 50 cents. On my Ohm meter, they show no >conductance in one direction and 1400KOhm the other way. >What do I need to get? RS (which is the only resource I >have available, I need them like _NOW_) has many different >kinds of diodes, ranging up to two dollars per pair. > >Thanks, >Bill Sudbrink

26 years, 2 months

Diode help... HELP!

by jeff.kaneko＠juno.com

Bill: You should test your diodes with an OHM Meter that has a high enough test voltage to overcome the barrier potential of approx 700mV for a silicon, and about 300mV for a germanium device. What sort of application are you looking use it for? For high current/voltage applications, silicon is pretty much your only choice, as they can be made with very high PRV (peak reverse voltage), and higher power rating. For small-signal use, germanium diodes work best; they have low barrier potential and lower 'ON' resistance (sounds like this is what you want). Used to be, the glass diodes RS used to sell were a mixture of both types. You can tell the difference with a DMM that has a 'diode' test range; the DMM will put enough voltage across the device to foreward bias it (turn it 'on') and display the apparent resistance of the device. Germanuim devices will have a lower apparent resistance. Another way would be to apply a (low) voltage across the device with a resistor in series, and measure the voltage across the device. Of course, all diodes have some reverse leakage current, and all diodes exhibit this 'barrier potential' phenomena; the trick is to find one with a low enough 'on' resistance that will satisfy your requirements. I used to get diodes from RS to make crystal sets; in those days, I found the best ones by wiring it into the set to test it! Jeff On Tue, 22 Feb 2000 16:06:49 -0500 "Bill Sudbrink" <bill(a)chipware.com> writes: > Hi, > > Once again demonstrating my vast quantities of ignorance... > I need a diode which completely blocks current in one direction > and presents as little resistance in the other direction > as possible. I bought a fist full of little glass ones at > Radio Shack for 50 cents. On my Ohm meter, they show no > conductance in one direction and 1400KOhm the other way. > What do I need to get? RS (which is the only resource I > have available, I need them like _NOW_) has many different > kinds of diodes, ranging up to two dollars per pair. > > Thanks, > Bill Sudbrink > ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: http://dl.www.juno.com/get/tagj.

26 years, 2 months

Diode help... HELP!

by mcguire＠neurotica.com

On February 22, Bill Sudbrink wrote: > Once again demonstrating my vast quantities of ignorance... > I need a diode which completely blocks current in one direction > and presents as little resistance in the other direction > as possible. I bought a fist full of little glass ones at > Radio Shack for 50 cents. On my Ohm meter, they show no > conductance in one direction and 1400KOhm the other way. > What do I need to get? RS (which is the only resource I > have available, I need them like _NOW_) has many different > kinds of diodes, ranging up to two dollars per pair. Hmm...keep in mind that all semiconductor diodes exhibit a forward voltage drop...0.3v for germanium and 0.7v for silicon diodes. If your multimeter isn't using more than that forward voltage drop to measure that "conducting-mode" resistance, you won't get anywhere with that measurement method. -Dave McGuire

26 years, 2 months

Rejuvenating VT320 monitors?

by CLASSICCMP＠trailing-edge.com

>> issue of _Processor_ and you'll find dozens of places that sell >> replacement CRT's for terminals of just about every make. >You're lucky!. Monochrome CRTs are almost impossible to obtain in the UK >-- most places that I've tried tell me that it's not worth replacing >them. This is probably correct if the unit in question is a \pounds 50.00 >portable TV. As long as we're on this subject - are B&W TV's with screens larger than 5 inches or so still common in the UK, Europe, Russia, anywhere? It's been at least 15 years since B&W TV's with 12" or larger screens were available here in the US. You *can* still find new composite-input B&W video monitors up into the 9" or 12" size range, but these are marketed towards closed-circuit TV (i.e. security) installations and tend to be more expensive than color TV's of the same size. -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927

26 years, 2 months

Information still needed for Infotron IF/65 Development System II for 65XX microprocessors and CUBIT EPROM Programming board - AIM-65 or KIM ?

by aek＠spies.com

Infotron made intellegent multiplexers, this might be a test set for that. They also made erzatz DH-11's a LONG time ago.

26 years, 2 months

The tandy TRS 80 with 4 drives (fwd)

by vcf＠siconic.com

This person has a TRS 80 that needs a new home. Unfortunately I don't know too much about it. Please contact the original sender for details. Reply-to: WADDL(a)aol.com ---------- Forwarded message ---------- Date: Thu, 17 Feb 2000 12:10:11 EST From: WADDL(a)aol.com To: vcf(a)siconic.com Subject: The tandy TRS 80 with 4 drives As far I know it is in good working order. I am in Corpus Christi, Texas Are you interested in it? Walter Dillard Sellam International Man of Intrigue and Danger ------------------------------------------------------------------------------- Looking for a six in a pile of nines... VCF Europe: April 29th & 30th, Munich, Germany VCF Los Angeles: Summer 2000 (*TENTATIVE*) VCF East: Planning in Progress See http://www.vintage.org for details!

26 years, 2 months

Simon Construction

by Innfogra＠aol.com

In a message dated 2/21/2000 9:33:13 PM Pacific Standard Time, jpl15(a)netcom.com writes: > If you have any Sense of Adventure, you might consider using > electrical distribution substation switchgear for the logic. It > would take up a little more space (maybe two acres) and use more > power, but... think of the kewl noise it would make! > My scrapper has been buying all of the electrical scrap from BPA (Bonneville Power Administration) in Vancouver, Washington for the last 10 years. If someone wanted to use electrical distribution substation switchgear for the logic it could be possible. He is shipping a container of it this week. Any interest? Paxton

26 years, 2 months

HP9114B battery pack

by ard＠p850ug1.demon.co.uk

A non-text attachment was scrubbed... Name: not available Type: text Size: 1435 bytes Desc: not available Url : http://www.classiccmp.org/pipermail/cctalk/attachments/20000222/3f7309e5/at…

26 years, 2 months

Sams Photofacts

by ghldbrd＠ccp.com

I have noticed that the earlier Sams are available now on CD-ROM. Don't remember if they are direct from Howard Sams or through third-party. I'm lucky, as there are complete libraries of Photofacts available at both the downtown KC library and in Independence. Even had them in Tacoma, WA so check your local library for availability. Might be able to get them through interlibrary loan. Gary Hildebrand Amigaphile and boatanchor collector

26 years, 2 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