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Hello Friends I've been reading about memory failure modes, especially for dynamic RAM, and wanted to hear from people about what they've experienced most on DEC equipment. Specifically I'm interested in whether there are many "cross-chip errors", or whether most are "single chip". The system...

Hi Friends For context: I'm working on getting a PDP11/53 running: starting with the basic KDJ11-DS CPU board (main thread). As I'm currently getting somewhat unpredictable memory errors, I'm trying to find more details about how the memory subsystem is designed. This board uses three blocks...

Hi Friends ... feel free to tell me it doesn't matter! I'm just starting to learn about QBUS and want to make sure to avoid casualties on my old equipment. Thanks! For context I'm working on the power-good signals BDCOK etc for an H9275A backplane for a QBUS KDJ11J-D/S (main story over here)...

Continuing my inventory of what I found in my storage ... A PDP11/34 with programmer's panel Never powered it up, I remember it as having a few cards in it. Jonathan.

More photos of what I found in my storage Believed to be MicroVAX 3100, I powered this up once about 20 years ago, I believe it has VMS on it. Jonathan.

I'm in the process of documenting what I've got. It's a KDJ11-D/S with 1.5 MByte RAM, very clean and shiny. Apparently that's the CPU for an 11/53. I've had it in storage for something like 20 years, never powered it up. It's got: M7554A CPU 2x A6006 analogue to digital cards 2x M3106 quad...

I have a few old PDP11s, none currently running. Finally I was able to get to my storage to take a few pictures of this PDP11/83 in vertical BA23. I bought it over ten years ago and have never even switched it on; it comes from Germany and has a Digital service log and so on. The model plate...