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

15 years

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. --------------------------------------------------------------------------

15 years

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.

15 years

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

15 years

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

15 years

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

15 years

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 --

15 years

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

15 years

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

15 years

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.

15 years

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test-drb September 2010