test-drb April 2012

test-drb@ccmp.vtda.org

195 participants
233 discussions

by donm＠cts.com

I have a couple of HPIB cables available at $15 the pair, shipped. They are: 1 HP10833A ~42" 1 HP92220R ~12" The 92220R has a right-angle connector at one end and the usual straight connector at the other. (I wonder if the 'R' indicates a right hand connector?) First come, first served. - don

12 years, 7 months

Century Data T2000 exerciser

by nasim786＠earthlink.net

Hi, This is a belated response to a post you made here: http://www.classiccmp.org/pipermail/cctech/2003-February/010641.html I happened upon it while doing a 'for fun' search on the net for anything doing with good ol' Century Data, my employer when I was young. Couldn't resist responding to the post, even if it was half a year late! The exerciser that you have is/was for the Trident series of hard disk drives (predecessor to the Marksman). I was the main (in fact, pretty much the ONLY) technician at Century Data/Calcomp, for these exercisers back from the late 1970's to the mid 1980's, when they were phased out. I retired in 1985. Have fun! (BTW, where'd you find one of these dinosaurs??) Take care, Nasim

12 years, 7 months

Tiny BASIC Extended available

by eds_2＠yahoo.com

Every so often, a discussion of Tiny BASIC appears around here. I was curious about one of the very first versions of Tiny BASIC, the 8080 implementation done by Whipple and Arnold, as documented in the Vol. 1 No. 1 (Jan 1976) issue of Dr. Dobb's Journal (of Tiny BASIC Calisthenics and Orthodontia) This issue contains an octal listing of a Tiny BASIC interpreter for the 8080, and I couldn't find this version available for download anywhere. So... I typed it in, and it works! I documented my work, which is available at http://oss.readytalk.com/tb/tinybasic.tar.gz (Note - this location is temporary - I need a home for this if anyone is interested) Included are the text file for the octal listing, a binary which can be loaded into memory, an attempt to extract the IL from the binary, and some instructions on bringing up Tiny BASIC. I was able to run some simple programs with a Z80 simulator that I've been running, and it appears to work correctly. I found the PDF of the listing in the ACM digital library: http://doi.acm.org/10.1145/987491.987494 Typing in octal listings is error-prone enough, and typing them in from bad PDF scans of bad photocopies is even trickier. I have corrected many errors, but I'm sure there are more. If any kind soul would be willing to proofread / correct the listing, it would be **GREATLY** appreciated. I hope this is of interest to people. I'm very interested in other versions of Tiny BASIC out there, if someone has ever typed this listing before, etc. I'm familiar with Tom Pittman's work, but other resources would be greatly appreciated. -Eric ____________________________________________________________________________________ Don't pick lemons. See all the new 2007 cars at Yahoo! Autos. http://autos.yahoo.com/new_cars.html

12 years, 7 months

MicroSD: one good ripoff deserves another / Iomega Zip's

by feldman.r＠comcast.net

>From: Dave McGuire < mcguire at neurotica.com > > >On 04/23/2012 05:59 PM, joe lobocki wrote: >> I use a SD to CF adapter in my canon digital rebel without an issue, as I >> can no longer find CF (I also haven't tried a camera store but they are >> probably a ripoff...) > >Where do you live that you cannot find CF cards?! That's insane. I >bought a handful a couple of weeks ago, and the guy I'm crashing with >here in FL this week has three brand new ones sitting on his kitchen table. I was just at my local Office Depot (a chain of large office supply stores, for those not in the US) in downtown Chicago and they have Lexar 4 GB CF cards for $25 and 8 GB cards for $40, in stock. Bob

12 years, 7 months

EPROM and EEPROM Programmers

by robert.jarratt＠ntlworld.com

I have some back-burner projects that will one day need me to start burning EPROMs and EEPROMs. I can't justify the cost of the big professional things costing hundreds of pounds. At the moment I know I will need to program a 27C1024 EPROM (40 pin DIP) and a 28C256 EEPROM (28 pin DIP), but it would be nice to have something that can handle a reasonable variety of devices. I believe the Willem programmer may be suitable, it is certainly affordable, would that fit the bill? It seems to come from Thailand, although there seem to be all sorts of sources on ebay, so I am not sure what the genuine source really is. I am also not averse to buying secondhand, ebay or otherwise, if I can get something that is going to be more generally useful than the Willem. Any advice welcome. Thanks Rob

12 years, 7 months

discrete transistor computer

by rickb＠bensene.com

Tim wrote: > In the late 60's and 70's, radio shack sold some little one-bit-flip-flop boards > with lamps. Each flip flop was a little square of circuit board. > > There may have been other logic functions available one-to-a-board. I'm > pretty sure they were discrete transistors for the most part (even the round > package SSI Motorola RTL typically had two gates or flip flops per package.) > > You could buy multiples and configure them as a counter, and I'm pretty sure > they could be wired as a shift register too. > > May have been "Archerkit" brand name. Or "Pbox" brand name although > what I remember were not Pbox's but circuit boards. > > I tried using websearches to find pictures or docs, but the Googles, they do > nothing! > I built something like this when I was probably something like 12 or 13 years old. I was purchased at Radio Shack as a kit. It was a four bit binary counter, with incandescent lights as on the Q outputs, (though discrete transistor drivers), and a photoresistive cell or pushbutton switch as the trigger. With the photoresistor as the trigger, when you waved your hand in front of the photocell, it would increment the counter, which was pretty cool. I distinctly remember the RTL IC's made by Motorola in the black plastic "blob" packages. I have vague recollection of the project being a mother board that had four small circuit boards that had the flip flop chip, transistor driver, and lamp (perhaps these were the boards that Tim mentioned). The mother board had a photocell, a toggle switch, and a momentary action switch with de-bouncing circuitry. You could trigger the counter with the photocell, or the momentary action switch. I think the thing ran off a 9V battery if I remember correctly. The photocell didn't have very fast response time, but I do remember putting it in front of a fan in a dark room with a flashlight shining through the fan blades, and made the counter go pretty fast. I think that I eventually damaged the chips by trying to make the thing count BCD rather than binary by adding some gating. That was the end of it. It was fun building and tinkering with, and educational. It was my first exposure to integrated circuits.

12 years, 7 months

WTB: Signetics 2650 Evaluation board PC1001

by pinball＠telus.net

Does anyone have one of these animals? I am trying to reproduce an old video game that was based on it and figured it might be easier with the Eval. board. Thanks, John Robertson Vancouver, BC, Canada

12 years, 7 months

[NO REWARD WHATSOEVER] Looking for IBM, ANSI, and Sun doc

by microcode＠zoho.com

I figured I should ask now while everybody is in a helpful mood :-) Does anybody have scans of any or all of the following? IBM 01. MVS/ESA Component Diagnosis and Logic: EXCP Processor (LY28-1477) 02. LY28-1487 03. LY28-1488 04. LC28-1166-5 05. SA22-7085-0 System/370 Extended Architecture Principles of Operation 06. SA22-7085-1 System/370 Extended Architecture Principles of Operation 07. SA22-7200 System/370 Enterprise Systems Architecture Principles of Operation ANSI American National Standards Institute ANSI X3. 74-1987 (PL/I Subset G) Sun UltraSPARC-IIIi Programmer's Reference Manual which is referenced here: http://hg.genunix.org/onnv-gate.hg/file/48f2dbca79a2/usr/src/lib/libcpc/spa… and here: http://download.oracle.com/docs/cd/E19683-01/816-1681/6m83631lh/index.html although without any pointers or links. I have the U/S IIIi User's Manual but this does not seem to be the one the above doc is referencing. No reward except my gratitude and promise to search my archives for my pals in need! However Al is making it pretty tough to have anything unique! Many thanks to Al for running bitsavers and everybody for contributing. I hope archive.org sticks around long enough for us to scrounge whatever is left on Sun but it's getting thin. I haven't been able to get to the open firmware site on playground.sun.com and the official site is running a business on openfirmware and isn't exactly giving out doc. So much for open. Thank you.

12 years, 7 months

EPROM and EEPROM Programmers

by ethan.dicks＠gmail.com

> Eric Smith wrote: >> ? ?Bill Sudbrink wrote: >> > Data sheet claims pin compatibility with 2732. >>> >> It claims that it is "pin compatible with existing ROMs and >> EPROMs (8K, 16K, 32K and 64K)", but that does not include the >> 2732, and their reference to 32K and 64K was only in regard to >> ROMs. > >> The TMS2532 is most definitely *not* pin compatible with 2732 http://www.atarimagazines.com/compute/issue11/69_1_ROM_EXPANSION_FOR_THE_CO… The 2532 _is_ pin-compatible for reading in a PET socket that's expecting a 2332 masked-programmed ROM. I've had several 2532s in my PET 2001N-32 (US version of the 3032) since the late 1970s, no adapter. These days, it's easier to build an adapter than find real 2532s. -ethan

12 years, 7 months

another HP2100 on govliquidation

by shumaker＠att.net

The 2 HP 2100's from GovLiquidation arrived a few weeks ago in incredible shape (after waiting some 8 weeks for DLA to decide I'm OK to acquire a weapon system component.....) Anyway, for anyone interested. there's another one listed - this time in Oklahoma. The title shows it as an "HP 21005 microprogramming systems computer" but it's clearly the HP 2100s mini in the photos! Event ID is 10728 Item No is 1510 Unit appears in good shape and already has a heavy duty shipping carton.

12 years, 7 months

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test-drb April 2012