test-drb September 2010

test-drb@ccmp.vtda.org

163 participants
222 discussions

by ard＠p850ug1.demon.co.uk

I havea shaft encoder here in a classic (well, it's over 10 years old :-)) printer. And it seems to have failed in that I am getting no signal at all on either output line (they should be quadrature signals, of couse). They test as floating.. I've taken in apart (of course, what have I got to lose...) and the PCB cotnains a Sharp IS501 OPIC device along with a couple of resistors conencted to it, a supply decoupling capacitor and a limiting resistor for the IR LED. THe latter seems to be working (dropping about 1.5V). but no outputs. The IS501 is a 6 pin stagered-DIP transparent package. The 6 pins are +5V, gorund, the 2 outputs and the 2 (sensitivity?) resistors. So not much I can so other than replace the chip. A qucik web search turns up nothing useful (and no data sheets). Anyone ever come across anything like this before, knows a substitute, etc? -tony

14 years, 2 months

HP 9816, and more, available in Eugene, Oregon

by tosteve＠yahoo.com

Dallas Hemphill has: 2 HP-9816 systems 2 HP-9121 disk drives 2 keyboards 2 6-pen plotters 1 2225A printer cables, operating system, software, and lots of manuals, from about 1983. contact Dallas if interested: dallashemphill at hotmail.com -------------------------------------------------------------------------- I apologize if you received more than one email - Yahoo "Classic" does this. --------------------------------------------------------------------------

14 years, 2 months

The lazarus 64

by christian_liendo＠yahoo.com

This is a bit off topic, but no so much. Here a guy designs his own 8 bit retro system and has somewhat documented the thing http://www.lucidscience.com/pro-lazarus-64%20prototype-1.aspx For all you hardware junkies, you will like this.

14 years, 2 months

FS: 80186 chips

by charlesmorris800＠centurytel.net

While reorganizing my parts cabinet, I came across three unused AMD '186 CPUs from the early 1980's, still in original antistatic plastic box. One 80L186-16, one 80C186-25, and the small one is also an 80C186-25. http://s1181.photobucket.com/albums/x426/DrCharlesMorris/?action=view&curre… $10 shipped in US; $10 plus actual postage internationally. thanks Charles

14 years, 2 months

68K ISA project

by lynchaj＠yahoo.com

Following up on this thread from last July: I found the 1989 mc magazine article on the 68K ISA coprocessor board. I have the article and have gone through it. Instead of an PC/XT ISA coprocessor, I've decided to pursue an S-100 68K CPU board based on the one in the "68000 Microcomputer Systems: Designing and Troubleshooting". Thanks! Andrew Lynch > -----Original Message----- > From: Andrew Lynch [mailto:lynchaj at yahoo.com] > Sent: Saturday, July 10, 2010 5:49 PM > To: 'cctalk at classiccmp.org' > Subject: 68K ISA project > > Hi! Just out of curiosity does anyone know of any home brew ISA bus 68K > boards? > > I've seen numerous home brew 68K projects of varying styles but none meant > to plug into the PC/AT ISA bus. I tried Google but nothing obvious turned > up. Ideas/URLs appreciated. > > Thanks and have a nice day! > > Andrew Lynch > > PS, something like this but with more detail > > http://john.ccac.rwth-aachen.de:8000/as/pcpar.html

14 years, 2 months

Slightly-OT: Anyone want a couple of boards from an AT&T MERLIN?

by jplist2008＠kiwigeek.com

While refreshing my memory of the bits and pieces of sundry I picked up with an IBM System/34 several years ago I rediscovered a pair of boards in-box that are marked AT&T MERLIN. They appear completely unused, bubble-wrapped in apparent original packaging. I don't know anything about the system, so if you want me to be able to identify _which_ boards they are, you'll need to give me some hints :) Shipping costs only, from 50441. - JP

14 years, 2 months

Advice for scanning docs

by snhirsch＠gmail.com

All, I'm trying to scan some documentation on "IBM PC" sized 3-hole paper. For some reason the scanner is prone to pulling multiple sheets through when doing the reverse sides. Doesn't seem to have this issue when doing the facing side. I haven't seen this with US letter size paper, either. Wondering if anyone has any tips for avoiding this? The scanner is a Umax Astra 2400S w/ Umax sheet feeder. Steve --

14 years, 2 months

Multimeter recomendations

by trag＠io.com

> Date: Tue, 21 Sep 2010 11:15:35 -0700 (PDT) > From: Fred Cisin <cisin at xenosoft.com> > Somehow, the absolute basics of even working with threaded fasteners have > fallen from the educational system, and people are re-inventing basic > normal techniques. > > > When is the demo on how to suck eggs? My experience is that most folks don't know what one means when one uses an expression about sucking eggs. I thought everyone knew the, "Don't teach your grandmother..." expression, but apparently familiarity with it is kind of rare. At least around here. Jeff Walther

14 years, 2 months

IBM 3179 terminal(s) wanted

by jwest＠classiccmp.org

Ok, as NICE as a pair of 3278 or 3279's would look in my herc setup - those aren't likely to be reasonably found. So I was looking for one or two 3179 terms to act as CMS or TSO user terminals. Anyone have some in working condition that they'd like to trade off? J

14 years, 2 months

seeking enter keycap for IBM Model 11C electric typewriter

by nigel.d.williams＠gmail.com

http://library.rider.edu/special_collections/typewriters/ibm1.jpg I am currently minding one of these on its journey to a local museum, but it is missing the enter/return key cap [*], if anyone has a spare please I would be willing to pay postage. The console I have was once used with the local Elliott Brothers Elliott 503 computer. thanks. [*] large square key cap seen at the right hand side of the keyboard.

14 years, 2 months

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test-drb September 2010