Recent content by ccureau

Apparently I didn't look hard enough...and I also wanted to give the community a chance to get my money than a company. The UC07 should work fine...thanks for pointing it out! EDIT - my mistake, looking back at my browser, was to search for `pdp-11 scsi` instead of `qbus scsi`. All in the...

Hi everyone! I'm looking for a SCSI card...they seem to be a little hard to come by. An Emulex would be great, but honestly any that supports a disk would work.

Thankfully I just got a good memory test from the boot ROM...it's a 11/23+, and it still works thankfully. Still quite a shock...and very thankful for the fuses on the power board!

Recently I acquired a H9276-A backplane, and decided that I wanted to give it a try. I looked through the LSI Systems Service Manual Volume I (https://manx-docs.org/collections/antonio/dec/ek-lsifs-sv-005-vol1.pdf) to understand what all of the jumpers and things are for since they're not...

From the (admittedly limited) research I've done (mostly looking through Micronote 5)... I have the opportunity to get a 11/23+ enclosure, which looks like it comes standard with a H9276 backplane. It looks like this backplane has all Q/CD slots in it. Micronote 5 seems to suggest that as long...

Regarding the EPROM: The stickers have long since lost their writing, so I'm not sure what version I have. I can see that they are SCM90448C, so 8k each. I'm not opposed to pulling these and seeing if I can read them with my programmer. I pulled the memory board and tested both in mode 1 and...

You are right...it is the power-up mode setting. Moving J18-J19 (mode 2) to J18-J17 (mode 1) is what causes the system hung condition. Here's a link to the manual: http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/KDF11-BA%20CPU%20Module%20User%27s%20Guide.pdf

Thanks to everyone for lending a hand here, and I apologize for still being a neophyte when it comes to the internals of a PDP-11. I plugged in the CPU board and the memory last night in slots 1 and 2, and turned on the system...no loss of magic smoke! The LEDs are cycling, but no output on the...

Thanks for the clarification! What I'm still not clear on is whether the KDF11B and the 512k memory can survive being inserted into the top three slots of my H9278A backplane, which are Q/CD slots. I've looked through the manuals for both cards, and all I can find is that jumpers W1 and W2...

With a little more digging, I found this in some mailing lists from 2003. If anyone can confirm, I'd be most appreciative!

I'm sure that this has been answered before, so my apologies...I couldn't get results by doing a search for "q/cd". I've just gotten a PDP 11/23+ (M8189-BA) and a 512k memory module (M8067) that I'd like to use to build a small system. I've got both a small H9270 backplane (not yet wired for...

Following up from another post... I've managed to do some more troubleshooting with my 11/83 CPU, and unfortunately it seems to need some help. While I can get output from the ODT, the system will not accept any input on the console port. I did check the switch 1 setting, and if I'm reading the...

You're right...there is a console port there. I had wanted to use the DHV11 for additional serial ports mostly.

Hi there, I'm in the process of building a PDP-11/83 system from some of the parts that I've collected along the way. Some of these are MicroVAX, some are just not useful to me. Make an offer, or let's trade. Since I can't test them, I can't guarantee them, but I was told that they were...

The backplane is definitely marked as H9278-A. Good callout though... I can try installing a smaller memory module I have, though I'm unsure that it works. I guess we'll see. Update: Seems all I have are some 18-bit memory modules...I don't think they'll work in a 22-bit system.