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
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
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
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.
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
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
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
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?
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
