Greetings, all,
While getting ready for VCF Midwest etc, I have been spending a lot of
hobby time in the past year digging out various DEC minicomputer items
and testing/repairing them. To that end, I've been staring at a DSD480
on top of a PDP-8 rack. It's one of the ones with the DSD 26-pin
interface. My question is that since there are several different
devices with that connector, are any of them compatible with each
other?
Specifically, here are the DSD interfaces with a 26-pin connector:
802130 DSD210 PDP-11 Interface (26 pin) (2130)
802131 DSD440 DSD210 PDP-8 Interface (26 pin) (2131)
802132 DSD210 LSI-11 Interface (26 pin) (2132)
804430 DSD440 PDP-11 PDP-11 Interface (26 pin) (4430)
804432 DSD440 LSI-11 LSI-11 Interface (26 pin) (4432)
808830 DSD880 (SA850/SA1004) PDP11 Interface Card (26 pin) (8830)
808832 DSD880 (SA850/SA1004) LSI-11 Interface Card (26 pin) (8832)
808836 DSD880/20/30 (SA850/Q240) LSI-11 Interface Card (26 pin) (8836)
It looks like the 2131 board is Omnibus and works with either the
DSD440 or DSD210, but on the PDP-11, can the 883x interfaces work with
older drives or do they only work with the DSD880 floppy/hard drive
box?
I remember where/when I got this DSD480, so it seems likely to me that
I have a PDP-11/34 with an 4430 board in it. I could probably use an
2131 board just so I have an Omnibus interface. I also have an 808836
board but do _not_ have a DSD880.
I've found the prints on bitsavers that cover the DSD440/480 interface
so I know what signals are there, but I haven't found the equivalent
docs for the DSS880, just user guides. Anyone here know enough about
DSD products to shed some light?
Thanks,
-ethan
All,
I'm not getting around to working on this hardware. Another potential
move coming up. What's the interest level out there for HP 1000/2000
hardware?
Computers:
* HP-2116A 8kB - the original HP computer. There is only one other
that I am aware of in existence. David Collins got theirs up and
running. Mine still blows fuses on startup.
* http://hpmuseum.net/display_item.php?hw=95
* HP-2100A - untested
* HP-2108 - working last I checked 64kB (I might keep this one)
* HP-2112 - working last I checked 64kB
Others:
* HP-7901A disc drive - untested (2.5mB)
* HP-7900A disc drive - untested, with external power supply (5mB)
* HP-7900A disc drive - untested, with external power supply
* HP-2748B paper tape reader - spins up, does not seem to pass data
* CCC tape punch - untested
* HP-2761A Optical Mark Reader - punch card reader. loading wheel
turned to goo long ago. probably restorable
* card slot expansion chassis. I forget the part number.
* dual 3 1/2" drive in hpio chassis might someday work with these systems
* non-hp 19" rack holding most equipment
* lot's of peripheral cards including interfaces for disc drives,
punch, tape, card, etc.
Photos on Google Photos. My Gallery App is down at the moment.
https://photos.app.goo.gl/ry648oCejfmjnuNf9
I'd guess it's about 1500 pounds of hardware. So, pickup in Salt Lake only.
Greetings, we've extracted the Executive ROS of the IBM 5100. The PALM
opcodes between the 5100 and 5110 should be identical. So we have
used Christian Corti emulator code to run that Executive ROS (under Wintel
environment). However, the CRC checks and transition to the Language ROS
apparently works a little differently on the IBM 5100 (compared to the
5110).
Not the CRC check method itself, but perhaps the addressing used to look
for the Common ROS. In the 5110, the Common ROS is more obviously a
separate device/card. For the 5100, I'm not exactly sure where the Common
ROS is (part of the Executive ROS card, or part of the BASIC ROS card?).
I've seen some APL-only 5100's, so I think that system could operate with
the BASIC card (but maybe that device slot still would have the Common ROS
segments?).
Hoping someone is available to maybe give suggestions or tips in how to get
this emulator code going with the IBM 5100 ROS's (see EMUV5110 in github;
trying to use that to run the IBM 5100 ROS's that are at archive.org).
NOTE: The Executive ROS for the IBM 5100 is a 64K binary (I think the last
20K of that is blank, all 0's). In contrast, the Executive ROS for the IBM
5110 is 32K.
I finally herded together the extant pictures of the KIM-1s I've had in the past and did a writeup:
http://www.glitchwrks.com/2022/09/18/kim1-boards-past
TL;DR is that during college I found a KIM-1 in an employer's warehouse. Later, I found a box with five more! These were all Virginia Tech surplus, and one of them is likely the first KIM-1 used for classroom instruction there. I'd intended to sell some of them, since who needs six, right? Unfortunately, I was forced to sell all of them, including the one I'd intended to keep for myself, due to economic/financial situations after graduation.
I've never seen anyone post about these particular machines, and I haven't seen them exhibited at VCF East, VCF Midwest, or HOPE. None of the sellers contacted me about them after the sale concluded. Is anyone here the owner of one of these particular KIM-1s? Do you know the owner? Did you use KIM-1s while at Virginia Tech? Please let me know!
Thanks,
Jonathan
Trying to identify two cables I ended up with, one to DE-9 and one to Mac 8-pin
mini-DIN. The other end on both is a male 9-pin mini-DIN. These clearly look
like serial cables, but to what? A cursory Google didn't come up with anything
obvious. They don't fit the Mac GeoPort or Sun SPARC serial ports because the
pins are slightly out of place.
--
------------------------------------ personal: http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser(a)floodgap.com
-- Don't let 'em drive you crazy when it's within walking distance. -----------
On 9/16/22 6:37 PM, Cameron Kaiser <spectre(a)floodgap.com> wrote:
> These clearly look like serial cables, but to what?
The Epson PX-16 used a 9-pin mini-DIN for the serial port:
https://electrickery.nl/comp/px16/px16org.html.
Fred Jan
All,
I have a TVI-921C at the museum. I power it on and it beeps
continuously. One long, solid tone that does not stop until I power it
off. How do I start diagnosing this?
--
-Jon
+44 7792 149029
I've discovered that three of my four RA8x drives (one 82 and two 81s) now
refuse to spin up. All the failing drives give "SPIN ERROR" as the reason
and I've discovered, by an combination of educated guessing and parts
swapping with the working drive, that all three have bad optical sensors for
the tachometer disk.
Surfing around I see that this is a known problem. Apparently the
compound that was originally used to pot these sensors turns opaque over
time and, being as they're optical sensors, that really reduces their
effectiveness. I've seen some reports of people trying to repair the
sensors by either sanding off a layer of the epoxy potting compound, or even
trying to dissolve it somehow, but that seems to be a little bit hit or
miss.
Doesn't seem like these should be hard to replace though. They're just an
infrared LED and a phototransistor in a cute plastic case, and that
technology is still pretty common today.
Has anybody found a replacement for them? Does anybody have any
suggestions?
Thanks,
Bob
