test-drb March 2022

test-drb@ccmp.vtda.org

87 participants
62 discussions

by ccth6600＠gmail.com

As there is no real cctalk traffic other than test messages I thought I post something a bit more interesting. Here is a short video of my fully restored DEC H500 Computer Lab with an 8-bit counter implementation including reset: https://www.youtube.com/watch?v=57xU3Xqnqx4 Enjoy Tom Hunter P.S. Is there some problem with the mailing list? The few "non-test" messages I get are often out of context.

2 years, 1 month

Found SYSTEM DOCUMENTATION FOR ALUMINUM COMPANY OF AMERICA WARRICK WORKS DATANET -30 REALTIME DATA ACCUMULATOR AND DISTRIBUTOR ... AUG 7 1964

by couryhouse＠aol.com

SYSTEM DOCUMENTATION FOR ALUMINUM COMPANY OF AMERICA WARRICK WORKS DATANET -30 REALTIME DATA ACCUMULATOR AND DISTRIBUTOR ... AUG 7 1964 Sent from the all new AOL app for Android

2 years, 1 month

Digitronics P135-20 Paper Tape Punch

by pbirkel＠gmail.com

I have the mechanism for a Digitronics P135-20 Paper Tape Punch. It turns out that Surplus Sales currently has one of these for sale; see item "(EQP) P135-20/35". It is accompanied by a three-page snippet of a much longer manual for this punch. See: https://www.surplussales.com/equipment/pdf/eqp-p135-20-35.pdf That's the only documentation that I've been able to find :-{. I'd very much like to find/acquire the remainder of this manual, or other relevant documentation. Can anyone help me? Thank you, paul

2 years, 1 month

testing

by jwest＠classiccmp.org

Test test

2 years, 1 month

RT-11 Kermit to/from a raw device?

by jacob.ritorto＠gmail.com

Is there a way to do this? Or perhaps a driver in RT-11 that I could point to an entire drive? If not, maybe I could write one with some community guidance? Would be a splendid way to write real media, or in my case, read the hundreds of 8" floppies I have sitting on the shelf here for archive. thx jake

2 years, 1 month

PDT-11 Virtual Terminal Monitor v1.07

by lee.gleason＠comcast.net

> and tried looping back pin 2 to pin 3 >on each serial + modem port and typing some characters, but nothing shows >up in vterm. ? PDT-11/150 terminal and printer ports ports all require a high on pin 20, DTR, before they can send characters.? I've never used the modem port on my PDT's but I suspect it requires the typical, pins 6, 8, and 20 wired together. Maybe you need to pull some of these pins high to loop around? -- Lee K. Gleason N5ZMR Control-G Consultants lee.gleason at comcast.net

2 years, 1 month

Muldivo Digiputer 1968

by silvercreekvalley＠yahoo.com

Spotted on ebay - No involvement in the sale - just tagging in case any one on the list has interest. "Muldivo Digiputer 1968 - Imperial Dialog: IBM Model B" https://www.ebay.co.uk/itm/203849003806

2 years, 1 month

While on the subject of cabinets...

by chrise＠pobox.com

On Tuesday (03/01/2022 at 04:36PM -0800), Marc Howard via cctech wrote: > I've got a PDP 11/34 I've never opened up. It's mounted in a H9642 > cabinet. I can't get the bloody thing to extend on the chassis track > slides. > > Is there a catch or lock screw on this unit? Mine (and we may be learning, is not be a proper configuration) does not have any release or catch to allow the CPU to slide out. I just grab it and start pulling and it slides out-- although it does not slide easily. That could be due to old, stiffened lubricant on the slides. BUT! make sure you pull out the front foot at the bottom of the rack to keep the whole rack from tipping forward if you do get the CPU to slide out. The CPU is a heavy beast and the rack WILL tip forward once the CPU is out far enough. Chris -- Chris Elmquist

2 years, 1 month

While on the subject of cabinets...

by pbirkel＠gmail.com

If it's mounted in a standard BA11-K, no. You should be able to pull it out partially (sufficient to tip up if you have rotating slides) and then there should be locking-buttons on the slides to prevent further extension accidentally. Depressing those buttons will allow you to completely remove the chassis and its attached inner slides; the outer slides will remain in the rack. Be careful with full extraction -- the power supply is heavy and the chassis is unbalanced. It's really a two-person operation, or one best accomplished with some sort of supporting mechanism (even wooden cribbing if you are so inclined). If it's anomalously mounted in a BA11-A (like the 11/44) then there is a finger-tab accessible through the front grill on the upper-right that pulls back a spring-loaded side-tab that engages the rack frame to prevent *any* extension whatsoever. Pull that away from the rack-frame and then pull out the chassis. Of course, it's possible that you simply have rusted slides that are binding, in which case you will simply have to use force. Recommend _pushing_ from the rear if "reasonable yanking" from the front isn't working. Although I've encountered a fair share of rusty slides, all have yielded (slowly) to repeated yanking/pushing, even if only a few centimeters at a time. Penetrating oil applied from the sides will help, but after cleaning and polishing the slides suggest that you use graphite or lithium grease to re-lub when reassembling. Others may have alternative lubrication recommendations. -----Original Message----- From: cctech <cctech-bounces at classiccmp.org> On Behalf Of Marc Howard via cctech Sent: Tuesday, March 1, 2022 7:37 PM To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Subject: While on the subject of cabinets... I've got a PDP 11/34 I've never opened up. It's mounted in a H9642 cabinet. I can't get the bloody thing to extend on the chassis track slides. Is there a catch or lock screw on this unit? Thanks, Marc Howard

2 years, 1 month

Racking a PDP-11/24

by robert.jarratt＠ntlworld.com

I am wondering if I have racked my 11/24 correctly. As you can see here: https://robs-old-computers.com/2022/02/10/pdp-11-24-progress/ I have put the CPU at the top and the two RL02 drives underneath. The problem is that the CPU enclosure catches on the RL02 underneath. There is a bit of play in the mounting bracket: https://rjarratt.files.wordpress.com/2022/02/cpu-mounting-bracket.jpg. With a bit of manipulation I can get the CPU to slide in. However, I am wondering if I have racked it correctly? I don't think there is room to move the RL02s down and it would presumably leave a bit of a gap below the CPU. There seems to be very little clearance between the CPU and the RL02 at the front but more at the back, but I am sure that the rails are mounted horizontally. Is it just a matter of tightening the big screws that hold the mounting brackets to stop the play? If so I am not sure I have a big enough screwdriver! Regards Rob

2 years, 1 month

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test-drb March 2022