test-drb April 2008

test-drb@ccmp.vtda.org

196 participants
307 discussions

by jos.mar＠bluewin.ch

Probably not too important, given that there are next to none running machines left, but I was able to recover source code for Medos 4.2, the operating system fot the ETH Lilith computer. No prizes for guessing that is coded in 100% Modula-2.... Jos Dreesen

16 years, 8 months

Replacement for QP1008 (HP9816 PSU)

by dr.emiel＠xs4all.nl

I aquired a HP 9816 with a faulty power supply. Thanks to the diagrams of Tony I found out that the switching transistor QP1008 is shorted and a 2n2222 but thats no problem. I googled for it and searched my datbooks but can't find any replacement or datasheet for it. So does somebody knows the specs or a replacement for this transistor ? There was also a second processorboard in it from Newport Digital with a 68020 at 33Mhz, does anybody know these boards? Rik

16 years, 8 months

Sirius1/Victor 9000 - has anyone ever seen one working?

by les＠frii.com

I have seen them working. In the day, I worked for a store which sold them, so I saw quite a few working ones. We also added touch screens (with s stylus) to quite a few of them. I remember discovering that the index detector on the floppy drives was not connected, like on an apple 2. The formating was completly soft sectored, which did not rely on a index pulse from the disk. I got in an argument with a Victor rep once about this. He was telling a story about an "idiot" customer, who was using 10 sectored hard sectored floppies (ala Northstar), and he told the customer that this was the problem. After some discussion with him, I opened a unit up, unplugged the wires from the index photosensor, and the unit still worked. He still didn't want to believe me. It also seems like the floppy used different speeds (rpm) on different tracks, running slower on the inside tracks and faster on the outside tracks to keep the same bit density at all places on the disk. There were more sectors on the outside tracks than the inside tracks. This would seem to preclude using a standard floppy drive.

16 years, 8 months

Anyone know where to find software for an hp 16505a prototype analyzer?

by batata1＠free.fr

Hello I'm french and i've be seen your comments in last year what about hard disk problem of HP 16505A. Can you help me Try to contact me please I search any information about this device thanks Fernando from Paris

16 years, 8 months

Atari SLM 804

by silvercreekvalley＠yahoo.com

There is an Atari SLM 804 on ebay (item 220224227774), I'm not the seller, but as these are quite rare thought the list should know. The SLM 804 is an early Atari laser printer using the ACSI (DMA style) interface. Ian. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

16 years, 8 months

cctalk Digest, Vol 56, Issue 26 Looking for a LM4250H 8 Pin DIP

by trebor72＠execpc.com

cctalk-request at classiccmp.org wrote: > Message: 2 > Date: Wed, 16 Apr 2008 11:01:54 -0700 > From: "Chuck Guzis" <cclist at sydex.com> > Subject: Re: Looking for a LM4250H 8 Pin DIP or A real good substitute > Date: Wed, 16 Apr 2008 11:17:07 -0500 > From: "Robert J. Stevens" >> I am Looking for a LM4250H 8 Pin DIP or A real good substitute. I found >> a Data Sheet but having trouble locating any Parts. I am hoping someone >> has one in their Parts Box TIA Bob in Wisconsin USE trebor07 at execpc.com >> > > My cross-reference charts say that the TI OPA704PA (in current > production and available from Digi-Key) is a drop-in substitute. The > Philips ECG944M may also work. > > Message: 3 > Date: Wed, 16 Apr 2008 11:33:41 -0800 > From: Brent Hilpert <hilpert at cs.ubc.ca> > Subject: Re: Looking for a LM4250H 8 Pin DIP or A real good substitute > > >> I am Looking for a LM4250H 8 Pin DIP or A real good substitute. I found >> a Data Sheet but having trouble locating any Parts. >> I am hoping someone has one in their Parts Box >> > > I have several NOS LM4250CN, date code 8121. > The CN in plastic 8-pin DIP, 0C to +70C. > According to the NS book, the H is metal can, -55C to +125C. > > Can throw a couple in the mail from Vancouver, Canada, if you don't find > anything faster/closer. > > What's the app?, does it really have special requirements? So many op-amp types > have been produced over the years. Perhaps I exagerrate, but they seem like > transistors in that a dozen modern types could cover substitution for the > entire range of types. I am trying to build a Clone of the Godbout S-100 Terminator for my Byte-8 Box. Looks like Unicorn may have what I want Thanks for all the replies Bob

16 years, 8 months

cctalk Digest, Vol 56, Issue 26

by cclist＠sydex.com

> Date: Wed, 16 Apr 2008 15:49:42 -0700 (PDT) > From: "Eric Smith" > The most common error I've seen in Z80 designs is to drive the clock input > directly from a TTL part. The minimum Vih for the Z80 clock input is > higher than the minimum Voh for a TTL part. The Mostek Z80 CPU manual > shows a circuit using a transistor as an active pullup to increase the > clock swing. With the clock driven by standard TTL, Zilog specified a 330 ohm pullup. I've seen lots of instances where the Z80/Z80A clock was driven from an LSTTL or even a "canned" crystal oscillator with no pullups at all. It might be that later steppings were more tolerant of clock voltage. If one had an 8284A in the hellbox, it would also make a good choice; Voh(min) for the CLK output is 4v--but that might not be considered to be "vintage". Some early S100 boards used an 8224 to generate the Z80 clock. Cheers, Chuck

16 years, 8 months

Scion MicroAngelo S-100 Board

by marvin＠west.net

For anyone that is interested, I just posted the subject board over on Erik's new site, The Vintage Computer and Gaming Marketplace at: http://marketplace.vintage-computer.com/ I'll be starting to list other items there during the coming days as well.

16 years, 8 months

Mark 1 TR-107

by aliensrcooluk＠yahoo.co.uk

Hi, Since this was a) based on the Star Trek Tricorder; b) made in 1996 and; c) the company behind it has gone belly-up, I figured this would be classed as on-topic. "Here's a direct example of life imitating art. The Mark 1 TR-107 tricorder from Vital Technologies was unveiled in 1996 as a real scientific device. It could monitor electromagnetic fields, weather, color and light. The company apparently made 10,000 of them before going out of business. Vital's product was modeled on the tricorders used in the 'Star Trek' series." http://www.news.com/2300-11395_3-6121389-6.html and here's another page about it: http://www.stim.com/Stim-x/0996September/Sparky/tricorder.html I don't suppose anyone here has one of these? Regards, Andrew B aliensrcooluk at yahoo.co.uk

16 years, 8 months

Monroe electromechanical calculators

by hcchandler＠mac.com

I was reading a 3 year old message you had written where you had acquired a Monromatic 8N-3-213 that was "broken". If you still have it I might be able assist you to get it working. Former service manager of Boston,Detroit and Seattle for Monroe. Harry Chandler P.S. I'm a friend of Ernie Jorgens

16 years, 8 months

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test-drb April 2008