test-drb March 2002

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Protect your vacation home against winter freeze for less than 30 cents a day!

by doaks＠thecottagemonitor.com

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22 years, 9 months

MicroMint BCC52 BASIC controller

by rigdonj＠cfl.rr.com

Does anyone have a manual for one of these? I bought one for $1 and now I know why. The 5V PS was putting out about 20 volts! I've fixed the PS and got the card talking to a terminal again after replacing about 6 ICs but I'm not sure of some of the features on it so I can't test it completely. Joe

22 years, 9 months

Blank Paper Tape Question (P.S.)

by Antonio.Carlini＠riverstonenet.com

> Andy Holt wrote: > >A _really_ fast paper tape reader was capable of 2000 cps ... but needed >special spooling arangements to feed the tape fast enough. And one built during WW2 would run rings around it (5000 char/second): http://www.codesandciphers.org.uk/lorenz/rebuild.htm >Very imptessive to watch when it was working properly ... and even more >impressive when it failed :-( The Colossus one was (at least once) run to the point that the tape failed - talk about paper cuts!! Antonio

22 years, 9 months

QBus Grant cards

by mcguire＠neurotica.com

On March 9, Doc Shipley wrote: > I dunno why y'all are so excited about them; I see them on eBay pretty > frequently. As in: > > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2008371320 > > Does this mean we should do a cooperative snatch? (DON'T go near > there, Dave) 8-) -Dave -- Dave McGuire St. Petersburg, FL "Less talk. More synthohol." --Lt. Worf

22 years, 9 months

MicroMint BCC52 BASIC controller

by mhstein＠canada.com

Have you checked MicroMint and the CCI archives? They're usually pretty good. If you really have no luck, let me know and I'll do some digging; might have some info. mike ------------------Original Message--------------------- Date: Fri, 08 Mar 2002 16:31:38 -0500 From: Joe <rigdonj(a)cfl.rr.com> Subject: MicroMint BCC52 BASIC controller Does anyone have a manual for one of these? I bought one for $1 and now I know why. The 5V PS was putting out about 20 volts! I've fixed the PS and got the card talking to a terminal again after replacing about 6 ICs but I'm not sure of some of the features on it so I can't test it completely. Joe

22 years, 9 months

Nice Manuals found up in the above garage storage area

by jrkeys＠concentric.net

I have not been up in the storage area for over 10 years and I found several items of interest up there; 1. AJ832 keyboard printer terminal operator's manual 2. IBM - Introduction to IBM Data Processing Systems C20-1684-2 a pretty cool book. 3.IBM - Introduction to Virtual Storage in the System/370 GR20-4260-1 4. IBM - An Introduction to Linear Programming GE20-8171-0 5. Data Storage System 370 service 6. HP 9825 Desktop Computer Quick Reference 7. HP 9825A Desktop Computer Operating and Programming 7. A notebook with the 9825 Customer Course in it: covers - introduction; mainframe; array variables; tape;strings; advanced programming; general I/O; HP-IB;9872 Plotter;9885 Floppy Disk; Matrix Rom. Also found some old IBM clear/blue reel tape covers and a few punch cards. Not 10 years old yet but yesterday at the thrift I picked up a Compaq Armada 7770DMT ( 233MHZ) laptop for $14.99. It was missing the powercord and CD-ROM drive. I was able to find a cord today but cost $20 at the second store I stopped at. I got it and so far the machines seems to work fine. I'm waiting to see if it will hold a charge.

22 years, 9 months

QBus Grant cards

by doc＠mdrconsult.com

I dunno why y'all are so excited about them; I see them on eBay pretty frequently. As in: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2008371320 Does this mean we should do a cooperative snatch? (DON'T go near there, Dave) Doc

22 years, 9 months

Blank Paper Tape Question

by mhstein＠canada.com

FWIW, all the PPT I have & have used is/was blank, and the perforators punched the feed hole along with the data. However, I also have some edge-punched cards, which use the same perfs & readers as PPT, and these ARE pre-punched, presumably to avoid long-term drift across cards. However, IIRC, the perforator does not punch the feed hole when it senses a card instead of tape. So, technically no problem either way, although re-punching an existing hole is not usually a good idea. For the curious, EPCs (not to be confused with the tiny 96 col cards which also have binary round holes) are similar to 80 col TAB cards but are continuous, connected with perforations at the ends and stacked accordion-style. They go through the PPT perforator just like PPT, getting punched along the edge, and are subsequently separated and used like other punched cards. Sounds like you're embarking on an ambitious project; I think you'd need some massive solenoids. The way it's usually done is to drive the punch pins with a motor-driven cam and the solenoid interposers only select which pins are driven. I've still got some punches & parts if you're interested; threw some of it out since no one seemed interested (except Steve, who understandably couldn't wait :), and it seemed like more hassle than it was worth, but I think there's still some stuff in the pile that'll be a lot easier to work with than building a perforator from scratch, either complete units or punch blocks/dies. Mind you, if you enjoy that sort of challenge I wish you well! And how about a reader (or two)? mike ------------------------ Date: Fri, 8 Mar 2002 19:36:13 -0600 (CST) From: Bill Richman <bill_r(a)inebraska.com> Subject: Blank Paper Tape Question Does regular paper tape normally come with the sprocket holes pre-punched, or does the device that punches the data holes also punch the sprocket holes? I recently bought some "paper tape" from eBay, and it looks like the right stuff except it's totally without holes. I don't think I've ever seen "virgin" tape before, but I had the idea that the sprocket holes down the middle came with the tape. I'm kicking around trying to build my own tape punch, since I have been unsuccessful at scrounging or buying one so far. I picked up some stainless steel flat and some rod of the appropriate diameter for the holes today, along with some solenoids for actuating said rods. I'm thinking of machining the stainless to make my own punch, but the lack of sprocket holes on the new tape has me confused. Do I need to add another solenoid and pin to punch a smaller hole for the sprocket, or did I just buy some odd-ball tape?

22 years, 9 months

DEC distribution tapes - VAX vs RISC

by Mzthompson＠aol.com

I was looking through my DEC tapes to see what VAX, if any, were there. I found most tapes clearly marked RISC, and none marked VAX. I did find a couple tapes, early versions of Ultrix. They were not marked as for VAX or otherwise, but were dated around 1987 or 1988. So the question is when did the RISC series of processors come into use, and are these 'unmarked' tapes likely for VAX? TIA Mike Thompson

22 years, 9 months

OT Mitsubishi Monitor Weirdness

by Lee.Davison＠merlincommunications.com

As an example, I use to work on some navigational transmitters with power output of a few hundred watts. There was a test jack for sampling the RF output and you hooked a scope to the jack. The gotcha was when you hooked the coax cable to the transmitter first instead of the scope. If you did that, the transmitter went down within seconds. This is rot! On a transmitter with even a few watts output the RF probe coupling would be -10dB or more, so even an open or short on this would give a return of -20dB. This is so small it can be ignored, in fact many antenna systems aren't that good. As a termination a scope is a very poor match for any low Z RF source it's impedance being 1Mohm or more so it wouldn't matter if you plugged it in or not. Also most test gear can't absorb any ammount of watts for any length of time, so if the port was a high power snif it would have to be terminated at the port with a high power attenuator which gives a good match regardless of it's terminating Z. The open circuit at the other end of the coax got reflected back to the transmitter as a low impedance and detuned it, and the monitoring circuits would detect the detuning and pull the plug. This depends entirely on the wavelength length of the coax. Did you use an exact odd multiple of 1/4 wavelength coax every time? can you remember the make/model of these transmitters? Lee. ---------------------------------------------------------------------------- ---- This email is intended only for the above named addressee(s). The information contained in this email may contain information which is confidential. The views expressed in this email are personal to the sender and do not in any way reflect the views of the company. If you have received this email and you are not a named addressee please delete it from your system and contact Merlin Communications International IT Department on +44 20 7344 5888. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

22 years, 9 months

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test-drb March 2002