test-drb April 2019

test-drb@ccmp.vtda.org

134 participants
129 discussions

by tsraguso＠gmail.com

I am selling an Atex PDP-11/34. The computer has: J11 CPU, 11 MB RAM, 2 BA11-LE expansion chassis, a second backplane, an SMD disk controller and LAN hardware. Items are all untested, sold as-is. Local pickup is preferred, but I will consider shipping freight. Please make an offer on the whole machine, or any piece of it.

5 years, 6 months

Adding floppy drives to my PDP-11?

by jnc＠mercury.lcs.mit.edu

> From: Charles Morris > it appears that the RXV21 will only work with an RX02 drive... So an RX02 can be jumpered to work with the non-DMA RXV11; but the DMA RXV21 can't be configured to work with an RX01. Which of these two is a more interesting/useful thing to be able to do? People at MIT used to theorize the existence of a virulent biological virus, 'Honeywell Brain Damage'; I wonder if there's a DEC mutation? > Just wondering what my options are for hooking up any kind of floppy > drives. I could sell the RXV21 and buy/trade for an RXV11 (M7946) > instead Those used to be fairly common on eBay for not many dineros; I only see one moderately expensive one at the moment, though. I'd definitely go this way, though - maybe Paul A has one available? Noel

5 years, 6 months

Dilog CQ1610 switch settings?

by charlesmorris800＠centurytel.net

I have a Dilog CQ-1610 serial line card (16 ports!) that I'd either like to sell, or at least put it in my backplane and play with it since I have a copy of TSX+ :) But I can't find any info, especially the DIP switch settings. All I see is "emulates a Unibus DH-11" but that is not even close for hardware/layout. Any thoughts? thanks Charles

5 years, 6 months

"arx-149" computer. .. what Is?

by couryhouse＠aol.com

It is in a? metal? suitcase appears? to? be? military analog? computer Ed! In a message dated 4/15/2019 11:52:41 AM US Mountain Standard Time, cctalk at classiccmp.org writes: On 4/14/2019 5:44 PM, Sam O'nella via cctalk wrote: > Is there a specific reference you have for this? > > Sent from my Apple /////c > >> On Apr 14, 2019, at 2:16 AM, ED SHARPE via cctalk <cctalk at classiccmp.org> wrote: >> >> "arx-149"? computer. .. what Is?thanks ed# > I'd like to know too. I never could quite understand just what Marvin The Martian said. " The *** 32 * **** um *space ** xx ** later *, :)

5 years, 6 months

"arx-149" computer. .. what Is?

by couryhouse＠aol.com

"arx-149" ? computer. .. what Is?thanks ed#

5 years, 6 months

DELQA?

by aaron＠aaronsplace.co.uk

Unsurprisingly the DEQNA card in my PDP-11/73 is quite unstable and results in 2.11BSD panicing. Is there anything that can be done about this? Other than unplugging it that is... I don't think there very much broadcast traffic making its way to the PDP. It's usually when I'm transferring files. If not, does anyone have a DELQA card they would be willing to part with (preferably in the UK) for a sensible price? Thanks, Aaron. -- Aaron Jackson - M6PIU Researcher at University of Nottingham http://aaronsplace.co.uk/

5 years, 6 months

FS: Qbus serial line cards

by charlesmorris800＠centurytel.net

I ran this ad back in 2015, will try again :) I was going through my board collection and found three PDP-11 boards I've never used in years and don't see a foreseeable need. No idea of condition, but they're visually clean and neat, stored in antistatic bags. The serial cards came out of my working 11/23+ but I've not tested them (since I already have a 16-line card and only 2 terminals). I have (one each): M7957 DZV11 Quad height 4-line serial card M8053 DMV11 "Microprogram Control" synchronous controller card (looks like it was intended for networking with 56k modems) Dilog CQ1610 16-line serial card. Make any reasonable offers. + shipping from US zip 65775. thanks Charles

5 years, 6 months

Adding floppy drives to my PDP-11?

by charlesmorris800＠centurytel.net

I have a PDP-11/23+ with two RL02's in a corporate cabinet but no floppy drives. Also an RXV21 (M8029) card. My PDP-8/A has RX01 drives, and I was hoping just to run the cable over to the -11 when I wanted to use floppies on it. But after some searching, it appears that the RXV21 will only work with an RX02 drive... Just wondering what my options are for hooking up any kind of floppy drives. I could sell the RXV21 and buy/trade for an RXV11 (M7946) instead, to use with the RX01 in the other rack. Or look for an RX02 that won't break the bank - but that won't fit in the corporate cabinet. I do have another cabinet but it's got other rack-mount gear in it at the moment. What about smaller drives (RX50? RX33?)... can those be interfaced to the 11/23+ Qbus? Other thoughts? thanks Charles

5 years, 6 months

Interesting article in Spectrum about IBM's System/360

by ce.murillosanchez＠gmail.com

Building the System/360 Mainframe Nearly Destroyed IBM https://spectrum.ieee.org/tech-history/silicon-revolution/building-the-syst…

5 years, 6 months

Daisywhell typewriter emulating a TTY

by couryhouse＠aol.com

I? remember? in '79? ?a? KSR? Diablo? was? ?the? dream? KSR? printing? terminal? and? ?cost? like? ?3? grand? Oh? how? we? used? to? dream of having one of these? back then! We? do have? one in the museum's? collection...? although? ?have not attempted to power up? to use. Ed# In a message dated 4/10/2019 8:40:58 AM US Mountain Standard Time, cctalk at classiccmp.org writes: On 4/10/19 8:16 AM, Jon Elson via cctalk wrote: > On 04/10/2019 03:38 AM, GerardCJAT via cctalk wrote: >> I would like to emulate a TTY, using a daisywheel typewriter. >> > Well, there are Qume and Diablo.? Diablo was bought by Xerox, so some of > them carry that label. > Most of the stand-alone versions had serial (RS-232) ASCII interface. I've given a couple of the Diablo KSRs (that's what the Hitypes with the keyboard were known as).? I didn't care for them much--no immediacy of sound and keypress--the two seem unrelated. Daisywheel printers are incredibly difficult to get rid of--nobody wants to pay shipping.? I got rid of the last one by throwing in a complete system with it.? Still have a NEC Spinwriter mouldering away. --Chuck

5 years, 6 months

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test-drb April 2019