test-drb June 2003

test-drb@ccmp.vtda.org

275 participants
520 discussions

by ssj152＠charter.net

Does anyone have a couple (2) of the AMP 10 pin connectors (with unused pins) used with the DLV-11J 4 port serial I/O boards or know where I could purchase them? What I actually need is a RS232 cable DB25 to AMP 10 ?, but I am willing to make the DB25 part myself, something I've done zillions of times. I am currently working on bringing up my "new" PDP-11/23 that I recently picked up. This chassis, once verified OK, will be used as a test bed to check out the bunch of QBUS boards I have, including CPU's, memory, and some I/O, mostly serial. Eventually I hope to bring up a 11/53 like the one Jonathan Engdhal built. Thanks in advance! Stuart Johnson

23 years

Talking to DEC disks controllers with non-DEC hardware(was

by pete＠dunnington.u-net.com

On Jun 5, 21:45, Tony Duell wrote: > I got a boatload of comms cards in a clearout. DUP11s, DMC11s, DMR11s, a > KMC11, etc. Even a couple of DX11s (not, that's not a typo for RX11). > Pity I've not nothing to connect the latter to. Last time I saw a DX11, it was a whole rack, not just one card. I think I know where to find something to connect it to, though :-) -- Pete Peter Turnbull Network Manager University of York

23 years

[Fwd: [swap] WTB: Technical/Scientific Mac Hardware + Software]

by jrasite＠eoni.com

This might be of interest to someone here... Jim -------- Original Message -------- Subject: [swap] WTB: Technical/Scientific Mac Hardware + Software Date: Thu, 5 Jun 2003 17:39:44 -0400 From: "Tom Bannon" <bannonth(a)egr.msu.edu> To: "LEM Swap List" <lem-swap(a)mail.maclaunch.com> LEM-Swap is for buying & selling Mac stuff. It is not a discussion list. See the FAQ for guidelines on postings, feedback, and dispute resolution. -------------------- To those of you that come across box lots of software or unusual hardware: I'm for older versions of scientific analysis, data logging, image analysis software that runs on biege Powermacs or even 68ks. Hardware interfaces that control scientific instruments are also of interest. Things that are biotech related would me most useful, but if you've bought box lots of software or hardware and think something might be laboratory related drop me a line. Its great to put older Macs to work in the lab even if the software/instrument isn't state of the art. Tom Bannon 48917

23 years

Qbus Backplanes

by pete＠dunnington.u-net.com

On Jun 5, 22:41, Peter Turnbull wrote: > On Jun 5, 17:31, vance(a)neurotica.com wrote: > > > > And what do you do if you want to use a QQQQ-only processor in a QQCD > > backplane? Put it in the QQQQ-end? > > I've never heard of a QQQQ-only processor. Do you have one in mind? OK, so I've just thought of one that might be. An early 11/03 quad-height M7264 was meant for a Q-Q H9270 backplane and presumably that's what Sridhar is thinking of. However, I don't think it's what he calls a QQQQ-only processor. I'd have to look at the print set or a board to be sure, but IIRC the M7264 actually has Q-Bus on its A&B slots, so it would be OK in a Q-CD backplane, so long as the module underneath it didn't use the upper contacts on its own C&D slots (C and D aren't bussed; the lower contacts on C&D are only connected to the upper contacts of the slot below). However, just before I hit "send", Sridhar told me what he *was* thinking of: > Yeah. DECsystem 5500. (MIPSFAIR-2) Chuch McManis told me it's > QQQQ-only. It normally fits into a BA430 which is a BA440 with no > PELE stuff in it. It uses out-of-band signaling (on ribbon cables) > for RAM. The short answer is "I don't know". FWIW, here are my thoughts. I would be amazed if it put any signal(s) on the relevant pin(s) on *both* the A&B and C&D slots (because that would lead to multiple signal paths). I'd be rather surprised if it put some on A&B and some on C&D, but if it did, or if it put QBus signals on C&D, it would definitely have to go in the first Q-Q row. Or maybe the second, something I saw about it suggests an I/O module is supposed to go in front of it, and then the argument applies to the I/O module, really. However, the logical way to build such a board would be with the QBus signals on A&B, like I believe the M7264 does -- unless the bus length is critical, and it needs the shortest path between the first and second rows, which is the C&D slots. But would it physically fit any other backplane than its own? Don't those new-fangled things have different handles to anything that fits a Q-CD backplane? Chuck? -- Pete Peter Turnbull Network Manager University of York

23 years

Teletype

by dwightk.elvey＠amd.com

Hi Bryan That is OK, as it turns out, he had a 50Hz motor anyway to match his line. He seems to have moved on to other more serious problems. Dwight >From: "Bryan Blackburn" <oldcomp(a)cox.net> > >Okay... That's what I get for not reading the original post! > >-Bryan > >Dwight K. Elvey wrote: > >>Hi >> The right idea, wrong direction. I would think that a >>60Hz inverter would work fine. You could get one of those >>automatic leveling battery chargers, a small gelcel and >>a 60Hz inverter. >>Dwight >> >> >> >> >>>From: "Bryan Blackburn" <oldcomp(a)cox.net> >>> >>>Wouldn't it be so much easier to make a power inverter to run at 50 Hz >>>and save all the time and expense of finding gears & etc. & etc.?? I >>>have a power inverter that would be a simple cap change (two of them) to >>>run 50 Hz. Output power is about 250 Watts now, maybe 175-200 at 50 Hz >>>(or would it be more?)? How much power does a 33 take? Discuss... >>> >>>-Bryan

23 years

GP-10

by dwightk.elvey＠amd.com

Hi Matt I don't have a GP-6 or GP-10. I do have a EC-1. I would suspect that you could do the bouncing ball simulation with the GP-10 ( I assume that means it has 10 op-amps ). The things you need besides capacitors and resistors is a couple of diodes for the nonlinear things ( like the ball bounce on the ground ) and sine/cosine source. The computer needs reset relays to set initial values for the integrators and pots to generate the constants. The HeathKit has you make an external sine/cosine source, using 60Hz from the wall. This typically doesn't do vary good with the noise that most modern equipment has, since they make the 90 shift with a highpass. The original Heathkit example used 9 op-amps but I came up with a way to do it with only 8. This leaves two to make a sine/cosine oscillator. I'll have to dig up the schematic that I put someplace. You can live without the sine/cosine, since it is just to make the ball round. To display, you need an oscilloscope or a X-Y plotter. As for setting the unit up, I suspect there is a balance adjustment for each op-amp. For my tube machine, I found that I had to balance the integrators for zero drift instead of zero voltage offset. I suspect that this is because input current offset and input voltage offset are not the same thing. Dwight >From: "Matthew Wadham-Gagnon" <mwadha(a)po-box.mcgill.ca> > >Hi Dwight, > >I've been looking for examples/labs that would take me through the correct >procedure to setup/operate a GP-10 analog computer. I found your email in a >discussion about the GP-6 along with links to two labs on how to use it. They >seem pretty good except for a few details that probably apply specifically to >the GP-6. > >Thanks, > >Matt > >Matthew Wadham-Gagnon >McGill University, Montreal >Mechanical Engineering, Honours

23 years

Teletype

by dwightk.elvey＠amd.com

Hi The right idea, wrong direction. I would think that a 60Hz inverter would work fine. You could get one of those automatic leveling battery chargers, a small gelcel and a 60Hz inverter. Dwight >From: "Bryan Blackburn" <oldcomp(a)cox.net> > >Wouldn't it be so much easier to make a power inverter to run at 50 Hz >and save all the time and expense of finding gears & etc. & etc.?? I >have a power inverter that would be a simple cap change (two of them) to >run 50 Hz. Output power is about 250 Watts now, maybe 175-200 at 50 Hz >(or would it be more?)? How much power does a 33 take? Discuss... > >-Bryan > >Tony Duell wrote: > >>>Hi >>> One could buy a new pulley and add some additional capacitance >>> >>> >> >>IIRC, the coupling between the motor and the rest of the mechnism >>consists of a pair of helically-cut gears on the end of the motor (one on >>the motor spindle, the other on a separate spindle). The driven gear is >>moulded integrally with a sprocket for a toothed belt that goes to a >>larger sprovket on the transmitter shaft. >> >>The gears are almost certainly custom parts and would not be easy to get >>now (unless you know of a souce of Model 33 parts...). Making them would >>also be non-trivial, I think, at least in most home workshops. >> >> ><snip>

23 years

Sig-Net disk reading

by gareth.knight＠ahds.ac.uk

Hi folks, I'm having trouble converting some Sig-Net (http://www.old-computers.com/museum/computer.asp?st=1&c=810) SD/DS 5.25 disks to a DOS format. I've tested some of the instructions on http://www.seasip.demon.co.uk/Cpm/oldflop.html (22Disk, PCW Explorer, etc.) with little success. Can anyone provide other suggestions for likely DOS apps to try? Cheers, Gareth Amiga History Guide http://amiga.emugaming.com

23 years

Qbus Backplanes

by pete＠dunnington.u-net.com

On Jun 5, 17:31, vance(a)neurotica.com wrote: > > And what do you do if you want to use a QQQQ-only processor in a QQCD > backplane? Put it in the QQQQ-end? I've never heard of a QQQQ-only processor. Do you have one in mind? -- Pete Peter Turnbull Network Manager University of York

23 years

Qbus Backplanes

by vance＠neurotica.com

Hello people. Is there any way to tell if a backplane is QQQQ or QQCD by looking at it, and without having to pull the backplane out of the chassis? What if I can find the model number of the chassis? Peace... Sridhar

23 years

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test-drb June 2003