test-drb October 2005

test-drb@ccmp.vtda.org

264 participants
655 discussions

Does anyone have a Radio Shack Electronics Learning Lab?

by terry＠terryking.us

John, Forrest Mims wrote that manual, as I recall. He hangs out sometimes at sci.electronics.design and in any case that would be a good place to ask... If you are still striking out when I get back next week, I'll look at copying mine.... Regards, Terry King ...On The Mediterranean in Carthage, Tunisia terry at terryking.us

19 years, 1 month

Piracy and the FPGA discussion

by vp＠cs.drexel.edu

"'Computer Collector Newsletter'" <news at computercollector.com> wrote: > I decided to automatically router all mail from MS (ironic initials!) > [...] Here are four examples from his web site at http://ivan.harhan.org/ > [...] So Michael Sokolov (MS) is living is California? I somehow pictured him in an abandoned ICBM silo near Moscow, surrounded by Soviet era VAX clones :-) **vp

19 years, 1 month

Chicago-area DECies?

by uban＠ubanproductions.com

I'm in the Chicago area. --tom At 04:42 PM 10/27/2005 -0500, Wolfe, Julian wrote: >Hey, I was just wondering if any of my fellow DECies on this list live >in the Chicago area, I know there were quite a few DEC shops around here >back in the day. >---------- >To unsubscribe (or subscribe) from (to) this list, send a message to >info-pdp11-request at village.org, with the first line of the message >body being "unsubscribe" or "subscribe", respectively (without the quotes).

19 years, 1 month

Japanese computers

by ajp166＠bellatlantic.net

> >Subject: Re: Japanese computers > From: Jules Richardson <julesrichardsonuk at yahoo.co.uk> > Date: Sat, 29 Oct 2005 14:11:24 +0100 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >William Donzelli wrote: >>>I'll see if I can find them when I get back to the UK and scan any >>>interesting bits in. >> >> >> I am specifically looking for info on the parametron computers of the late >> 1950s, and the Hitachi AS/6 (may be called a HITAC in a Japanese >> context) of the late 1970s. > >I'm almost certain there was some mention of Parametron, amongst others. >Probably way too early for HITAC. I seem to recall an article about a >project to build a one mega-word memory unit too, which I suppose was a >rather impressive size for then (particularly if you wanted to make it >reliable!). Our machines of that era are all around the 4KW mark... 4KW was common but even the TX2 was far larger than that and that was pretty early transistor machine. By mid 60s machine of size were in the 16-64KW range. Keep in mind even the designers of the time understood that large reasonably fast randomly accessable memory was a factor in computational speed and overall perfomance. Of course there was a divergence that appeared during the mid 60s with Cray, LINC and PDP-8 to mention a number of small word (16bits and under) machines appearing with smaller memories and simplified archetectures appealing to the controls and emerging "MiniComputer" market. As to large memories by 1962 it was well understood the real problem was heat, power and consistancy of the magnetics and they were well on the way to a good handle on those. The main enemy was cost. Core was expensive per bit. Allison

19 years, 1 month

Zenith Z171

by benoit.bourgier＠gmail.com

Hello, I saw that you got a zenith Z170, well, i've got a Zenith Z171, and i want to sell it, do you know what is the price for this kind of device? Well, if you can tell me a price, that will be greatfull... Thanks in advance. Bye Ben

19 years, 1 month

OT (sort of) - PowerPoint help for my VCF exhibit

by news＠computercollector.com

Is anyone here really good with PowerPoint 2003? I could use some help (phone) tomorrow (Saturday) around the early afternoon EST. Email me OFF-LIST PLEASE if you can assist. Thanks!! - Evan ----------------------------------------- Evan Koblentz's personal homepage: http://www.snarc.net Computer Collector Newsletter: http://news.computercollector.com Mid-Atlantic Retro Computing Hobbyists & Museum: http://groups.yahoo.com/group/midatlanticretro/

19 years, 1 month

East coast movie - wants to rent old computers

by tosteve＠yahoo.com

Help Jennifer (in NYC) if you can! > Jennifer Greenberg - email: > yougotjen(-at-)yahoo(-dot-)com > > I am working on a movie for which I will need > computers from the mid 1970's, and > mid to late 1980's. I am wondering if you know of > any sources on the east coast who might be > interested in renting such things. > > Warm Regards, > > Jennifer > __________________________________ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com

19 years, 1 month

IBM 5155 Power supply schematics or info

by dwight＠ca2h0430.amd.com

>From: "Alberto Rubinelli - A2 Sistemi" <alberto at a2sistemi.it> > >I'm thinking about some protection circuit, because the switching try to >startup, for a time less then half second, and then stop. Now I can try to >check il any protection become active during startup. >The SG3524 il correctly powered and try to fire up the switching >transistors, via the pulse transformer, but only for a short time. > Hi Alberto One thing that I've seen on some switchers is something that watches to see if the transformer/coil core saturates. It is a simple coil that picks up the stray magnetic fields when the coil is overloaded( that often causes the blowout current in the switching transistor ). One has this detection circuit clamp the gate voltage to the switching transistor when it see excess leakage flux. It works better than a simple current detect because it self compensates for the cores temperature. If there is a current overload, it will keep the circuit >from powering up. One could put a LED on it to visually detect the condition. Dwight

19 years, 1 month

VMS Drive Cleanup Assist

by classiccmp＠vintage-computer.com

Hey all, I've got a DEC Alpha system that I can grab from work but not until I clean off the hard drives. It's a really nice system (server tower plus expansion, tons of docs and disks, etc.) that I'd like to make available at the VCF. The question is: how do I clean the drives completely without any real chance of data being recovered? The only other option would be to leave the drives behind so they can be crushed. I don't really know VMS and I'm not sure what versions are available, etc. Any help would be appreciated. -- Erik Klein www.vintage-computer.com www.vintage-computer.com/vcforum The Vintage Computer Forum

19 years, 1 month

Hobby-related blogs, anyone?

by news＠computercollector.com

Does anyone here publish (or can recommend) well-written blogs focusing on vintage computing? I'm aware of bytecellar.com and retrothing.com but would like to list some more on the newsletter homepage. - Evan ----------------------------------------- Evan Koblentz's personal homepage: http://www.snarc.net Computer Collector Newsletter: http://news.computercollector.com Mid-Atlantic Retro Computing Hobbyists & Museum: http://groups.yahoo.com/group/midatlanticretro/

19 years, 1 month

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test-drb October 2005