test-drb

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101090 discussions

Terak 8512 external 8 inch floppy drives

by jfoust＠threedee.com

I'm tinkering to connect the CBMStuff.com SuperCard Pro to eight-inch floppy drives. The SuperCard has a contemporary 34-pin floppy connector. The Terak 8510 main unit held a drive and its system cards, and its external 8512 drives just held a power supply and a floppy drive. The ribbon cables between 8510 and 8512 are 40 pin. The 8512 doesn't have its own power switch. The back of the 8512 has a small circuit board. (And by "back", I mean the board is actually exposed, which seems odd for a computer that's otherwise built as robust as aircraft or mil-spec.) It accepts the 50-pin cable from the internal floppy drive and has two 40-pin male for daisy-chain ribbons to the 8510 and additional 8512. The board has a socket for a drive terminator and a DIP for setting the drive ID. The 8512 power supply has a relay that must be sensing a signal on the 40-pin cable, as that's what turns on the 8512. Similarly, the Terak main unit's single power switch controls the Terak mono monitor. I haven't traced the signals on the board yet, and I have not yet found a doc that explains the cable pin-out. Because I have a bunch of 8512, it would be convenient for me to be able to use them as self-standing eight-inch drives. I purchased one of John Wilson's 50-pin Shugart to 34-pin adapters for its generation of the TG43 signal and the LED blinkenlightz. I'm tempted to tease out the Terak's 40-pin pinout and perhaps make some sort of adapter to go to 50-pin. - John

11 years, 5 months

MicroVax II in original DEC Rack on Ann Arbor MI Craigslist

by slandon110＠gmail.com

Thought id share this with you guys. http://annarbor.craigslist.org/sys/4913726464.html He says his bottom dollar is $250. I could possibly coordinate pick up if someone out of the area wanted it. Just cover my gas is all I ask. Steve

11 years, 5 months

MicroVax II in original DEC Rack on Ann Arbor MI Craigslist

by tiggerlasv＠aim.com

The BA23 isn't as stripped as mentioned earlier. The front-panel bezel can be seen laying in the bottom of the rack, and the back door to the chassis is present, with no empty filler plates. I've seen photos of the inside of the chassis, so I have some information on the contents - The backplane is fully populated with boards -- there are no empty slots. 1.) Some sort of MicroVAX CPU, with unknown amount of memory. 2.) 2 x Emulex CS02's (32 serial lines total) with the possibility of the rack-mount bulkheads. 3.) RQDX3 controller 4.) TQK50 controller 5.) DZV11 controller There is another quad Emulex board (model unknown) as well as an unidentified dual-wide board. One of these is a pertec controller -- I just don't know which. T

11 years, 5 months

Accurite Technologies

by cctalk＠fahimi.net

I was wondering if anyone out there knew if these guys are still in business? I want to order something but before sharing my CC info I actually want to make sure there is someone on the other end of the line. I've tried emailing them and calling multiple times. Emails have gone unanswered and the number is never picked up. It goes to what seems to be a generic home answering machine. Thanks. -Ali

11 years, 5 months

Dilog and Emulex boards

by useddec＠gmail.com

While looking for parts for a fellow list members project, I found these-again, and decided it was time they found a new home. I have more than one of a few. If interested please make an offer off list. $10 shipping for one or all within US. If you are outside the US, please send me your city, country and mail code. Thanks, Paul DILOG DQ130 DQ686 Emulex SC01 SC03 TU11 TU121 UC171 QD241

11 years, 5 months

San Diego, CA: 1991 ERA AS400

by mstaunton＠roadrunner.com

Sorry got really sick. Below is the model numbers. I will supply more info if anybody is interested Pricing is open due to shipping weight is included CRT monitors working with cables HP A4033A 65lbs HP A45764 75lbs servers/workstations HP Visualize C180 30lbs HP Apollo 400 MOD#A2193A 90lbs Mentor Graphics HLN5065W 100lbs I clan also be contacted via cell 7607030986

11 years, 5 months

2 big anniversaries are looming

by jfoust＠threedee.com

I was hoping for an Amiga event in the USA. Oh, there's this! http://amiga30.com/ at CHM, July 25. - John

11 years, 5 months

Another question about core sense amplifiers

by rickb＠bensene.com

OK, while we're on the topic of core memory sense circuitry, in some of the old calculators that I've come across (a good example being the Casio AL-1000 -- http://oldcalculatormuseum.com/al1kck10l.html) ) there are transformers (pulse transformers) in the core memory sense circuitry. What purpose would these serve, and why are they used in some core memory applications, and not in others? In the case of the AL-1000, similar transformers are used in the X-Y drivers as well. Core memory sense amps and drivers are that mystical analog stuff that I don't understand very well :-) Can someone enlighten me about these transformers? Thanks, -Rick --- Rick Bensene The Old Calculator Museum http://oldcalculatormuseum.com

11 years, 5 months

VAX-11/750 memory in 11/70 ?

by pontus＠update.uu.se

Hi all I was told that VAX-11/750 memory could also be used in an PDP-11/70 (or maybe some other model). Is this true? I have also read that there are three kinds of memory boards for the 11/750: M8728: 256k byte memory array; M8750: 1M byte memory array; M7199: 4M byte memory array. (As well as some third party boards. Which one of these, if any, could be used in an 11/70? Kind Regards, Pontus.

11 years, 5 months

Question about core sense amplifiers

by v.slyngstad＠frontier.com

I've got a technical question about core memories. I've been looking, in particular, at the MC1540G sense amplifier. There's an external capacitor that is supposed to be connected between pins 1 and 10 (it looks like about .01uF was traditional). Maybe I'm being thick this week, but I don't quite get what this does for the circuit. It's part of the "DC restoration" section. I think I have some idea what amplification and slicing mean in this context, but "DC restoration" isn't firing any neurons. Can any of you that have studied how core works help me understand this? Thanks, Vince -- o< The ASCII Ribbon Campaign Against HTML Email!

11 years, 5 months

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