test-drb November 2019

test-drb@ccmp.vtda.org

147 participants
137 discussions

by cz＠alembic.crystel.com

Finally got my xxdp+ floppy in the mail. The RX50 is flakey (probably needs a head cleaning, 95% isopropyl safe on these heads?) but I have it booted. Problem is in the RQDX3 formatter the drive shows up as drive 0, but generates an FCT write error. Questions: 1) I assume all cables in the BA23 chassis should have pin 1 to the left (away from fans), correct? 2) On the RD54 should it be jumpered as drive 1, or drive 4, or something in-between? 3) On the BA23 panel I assume the ready light should be on, the ready buttom for the RD54 should not be pressed, and the write protect light should be off with the write protect button not pressed, correct? One step at a time, as they say.... C

4 years, 5 months

FPGA based 3174 replacement

by cw＠cfsimmons.com

I have made the module available at https://github.com/cwsimmons/raw3270 For now it probably looks like a mess, but I hope to add comments and build the coax circuit later this week. I just wanted to get it out there now since I know there is interest. Chris

4 years, 5 months

3270 controller simulation

by cctalk＠gtaylor.tnetconsulting.net

On 11/18/19 3:14 PM, Ethan Dicks wrote: > I could fill books about the topic... we sold hundreds of Unibus and Qbus > boards (and a few VAXBI boards) for bisync, and dozens of boards for SNA. ~chuckle~ > I have all the hardware and software and documentation from Software > Results, but there is nobody left out there to talk Bisync to. I wonder if some of the people in the mainframe community would be interested in running Bisync. But I don't know what sort of hardware interface would still be usable. :-/ There's work afoot to create a new BITNET. But I think that's using NJE, likely across TCP. -- Grant. . . . unix || die

4 years, 5 months

RX01 wants

by fritzm＠fritzm.org

Hi all, I recently picked up a ?tabletop? RX01 drive for cheaps. So now I?m in the market for: - RK11 controller - cables - rack ears, rails (how was this done?) - formatted media If anybody here might have any of this and like to work out a deal, feel free to let me know off-list! thanks much, ?FritzM.

4 years, 5 months

Houston Computer Museum Warehouse Liquidation

by tsraguso＠gmail.com

I have located the Cray Y-MP EL, in addition to other other interesting items, including an Intergraph 6400 workstation with tablet, a PDP-11/23, an IBM System/34 with 5251 terminal and keyboard, a Unisys A-Series mainframe, and a Symbolics 3640 Lisp machine (includes console, but there is no keyboard). Pictures can be found here: https://photos.app.goo.gl/rgkBddeuosjnJ3TC6 I am taking offers on all of the above listed items. Thomas Raguso

4 years, 5 months

Rechargeable Gum Stick Batteries

by cctalk＠ibm51xx.net

I am just wondering if anyone out there has a source for cheap but reliable Rechargeable "gum stick" batteries. I am trying to replace some old batteries and the only source I could find are these: www.amazon.com/dp/B0047ZW46C/. Not sure on quality of the generic green batteries, especially since they are going to be in a computer on an ISA card and not easily visible. TIA! -Ali

4 years, 5 months

Question about "Distributed" in the DFT name.

by cctalk＠gtaylor.tnetconsulting.net

On 11/18/19 9:47 AM, Jay Jaeger via cctalk wrote: -- Grant. . . . unix || die

4 years, 5 months

FPGA based 3174 replacement

by cw＠cfsimmons.com

As it happens I wrote a Verilog module last week for serializing and deserializing 3270 coax frames, without realizing someone had already done this with an arduino. What I?ve written is intended for a zynq device but is general enough to be used in other designs. At the moment I have petalinux installed and can send frames with a small test program and see them on my scope. A loop back configuration also seems to work. I haven?t build the coax driver circuit yet so I can?t be sure of it?s correct operation. I?d be willing to make this code available tonight. Although I?m not sure how many people have the right hardware lying around. Chris

4 years, 5 months

old PDP/DEC PSU hardware question

by iain＠csp-partnership.co.uk

I have a query out on VCFed, but I am not gettin gany interest. Neither did my 2015 request on a similar topic - must be the wrong forum. Advice please: where is the best place to get some troubleshooting tips on debugging a DIGITAL H7202B power supply? I have 2 supplies that are giving me trouble. I am competent at digital work, much less so on switch-mode and analogue (555 is an analogue in my books!). I have variacs scopes, logic analysers, voltmeters but no skill ;-( Any advice?

4 years, 5 months

UniBone: Linux-to-DEC-UNIBUS-bridge, year #1

by j_hoppe＠t-online.de

Its been a long time since last public post about UniBone, time for a bragging broadcast. *What it is:* In case you forgot: UniBone is a plugin board to DEC PDP-11 UNIBUS systems containing a BeagleBone Black. See http://retrocmp.com/projects/unibone. This combo can simulate PDP-11 devices embedded in a physical machine. So you can operate and repair incomplete UNIBUS PDP-11s and even VAXes, just by emulating the missing parts. Disk drive emulators accept SimH image files, which can be ftp'd to the emulator (no SDcard changing!). As UniBone can acquire bus mastership, its also UNIBUS diagnostic console, as well as stimulate individual UNIBUS lines. Realtime stuff is implemented on BBB's PRU coprocessors. All programming is done in plain C/C++ under mainstream Debian Linux. *Whats new in 2019:* UniBone started with memory and RL11/RL02 emulation. In 2019 we did a lot of programming and debugging (suppressing endless techno-babble here). Thanks to some gifted supporters, we have now these devices: - DL11 serial port (first concept by David Richards) - 11/20 CPU (Angelo Papenhoff) - RK06 and MSCP disk drives (Josh Dersch) In fact UniBone implements now a complete PDP-11 system... a bit like a SimH with UNIBUS interface. UniBone was tested (at least) against PDP-11/05, '34, '44, '84 and VAX 11/750. Verified OSses include XXDP, Unix V6, 2.11BSD, RT11, RSX11M/M+, VAX 4.3BSD and Ultrixes. Special thanks to Mark Matlock for endless testing. *Available?* Soon. About 25 complete systems were distributed, and the same amount in kits. Not much complaints. User group at https://groups.google.com/forum/#!forum/unibone Just now I'm planing for a 2nd lot. And it will be shown on http://vcfe.ch/doku.php in Zurich on Nov 30th/Dec 1st, probably plugged into a PDP-11/05. best regards, Joerg

4 years, 5 months

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test-drb November 2019