In case you need a half-height SCSI enclosure to add to your VAX etc, I
put one up on EBay.
Item ID: 224332273248
https://www.ebay.com/itm/224332273248
Van Snyder
> I have a feeling there are two shell designs for the 6 pin.
Like I said, I have a vague memory of another keying design (I think it used a
ridge running parallel to the direction of insertion), but I don't think it's
>from any DEC gear. There is definitely yet _another_ keying design, with
triangular sawteeth, but again, I don't think any DEC gear used that.
> The one on my DD11-DF that I want to mate has detents in the corners
> while the catalog picture for the 6 pin on your part number shows a
> square in the center of the side.
Yes, the ones on the DD11-[C,D] (female shell, male pins) have 2 filled-in
corners, and the ones on the harness into which they plug (male shell, female
pins) have both the cutout corners (to match the filled-in corners on the
female shells), _and_ "a square in the center of the side".
As I said, I had verified that my female shells plugged into the male shells
on an -11/40 harness; I just went and checked, those males have the exact
identical shape to the ones I got (with the listed part number), including
both cutout corners and the square in the center of the side. (Oddly enough,
the 15-pin male shells used in that generation of DEC power connectors do not
have the square in the center of the side, just the cutout corners.)
Noel
I do not know this guy, this came through my site, but if you do have info
that you think he might find useful and would like to share please contact
CECIL the Specific.
VintageComputer.net Inquiry Contact Information Name: CECIL CRAIN
Email: ccrain at rgoldlegal-got-com Phone: 4157869527
------------------------- Comments:
I'm looking for any information about Bakelite insulating
materials and phenolic resins used in Univac DCT products manufactured
in the Salt Lake City facility from 1970 to 1978.
VintageComputer.net
---------------------------------------------------------------
Bill
> Are the power connectors on the DEC PDP-11 backplanes (e.g. DD11-DF
> 15pin and 6pin) Molex or other?
> Are they still commonly available?
https://gunkies.org/wiki/DEC_power_distribution_connectors#Connectors
I'm not sure why I bothered to write all this stuff up; it was clearly a waste
of time.
Noel
> I may have gotten the wrong 6pin shell.
I have this very vague memory of some similar connector shell, but I have no
memory of what the difference is.
I just checked the shells I have here, and they definitely fit onto the power
harness on an -11/40; and the numbers on the Web page are correct.
If yours arrives, and it works, please send me the number and I'll add it to
the page. Actually, if it _doesn't_ work, send me the number, and I'll add a
'no not use xxx, it doesn't work' note.
Noel
I have an HP 9817 and 9133D disk drive that I am trying to get going. The 9817 has a 98204B composite video card. I can mess with the settings of a composite monitor enough to barely read the text on the screen, which indicates that the machine is trying to boot from device A. I tried to make an image of the hard drive in the 9133D using Dave's MFM emulator, but the drive is pretty much toast and I wasn't able to recover much from it. If I connect the drive to the computer, it fails to boot and goes into BASIC.
I do not have a compatible HP monitor or HIL keyboard to use with the machine. I was planning on building a PS2 to HIL converter, but having an actual keyboard would be far easier. Likewise, having a monitor would be easier than abusing a normal composite display into working.
It looks like there were a bunch of compatible monitors back in the day. The 35721 and 35731B are mentioned on the HP Museum website.
In playing with DECnet I built a DDCMP implementation which deals with a byte stream, normally from a UART. So that works nicely with async link DDCMP as found in RSX and several other operating systems. But the speed is limited.
The other option would be synchronous links, which would enable connections to DMC11 or the like at speeds up to 1 Mb/s. But synchronous comm devices that connect to modern computers aren't so easy to find, though I have seen a few.
After playing with Arduino for LK201 keyboard emulation I started to wonder if one could be made to be a synchronous comm link with a USB back end, with low level things like byte framing and maybe DDCMP packet format handling in there, but the protocol state machine in the host behind the USB interface. For moderate speeds that seems entirely practical. For 1 Mb/s, probably not, though perhaps one of the fast ARM based units with its built-in SPI could be warped into that.
The alternative would be something like a BeagleBone Black (or Green) such as David Gesswein used as the engine for his MFM hard disk emulator. That clearly could do the job without any strain.
So I'm wondering: would there be interest in such a thing? If yes, should it be a modem-connected one (RS232 signaling, bit clock supplied externally by a modem or modem-eliminator)? Or should it be the "integral modem" short distance type, the ones that used a pair of coax with 4-pin AMP connectors like this https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/2… ?
paul
So, DEC part numbers (xx-yyyyy-zz) have a system where the 'xx' says what
_kind_ of part it is; e.g. bootstrap PROMs are all 23-xxxxx-yy. I seem to
recall reading at some point something which listed all the xx- codes, and
what they meant - but now I can't find it. A Web search didn't turn it up, and
it's not in the 1974 'engineering handbook'?
Does anyone recall seeing it, and if so, where?
Obviously, I could look through a bunch of print sets, and reconstruct it
(e.g. 90- seems to mean mounting hardware - nuts and bolts, etc) but I'd
rather not put the time and energy into reconstructing the wheel, unless
there's no other way.
Noel
Looking for HP marketing posters, in English and other world laguages large systems like HP-3000 as well as HP-150 and other pc and workstations...?? urgent need for monarch butterfly HP-150 poster!!!? Will be part of smecc museum hp display. -? Thanks Ed#
Does anyone still have one of these with the 50 pin drive splitter card and could take some pictures?
I picked one up a while ago and just noticed a 20 pin part is missing at U91, probably a PAL :-(
