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I figure many of the forum members probably visit their local e-waste facility at least occasionally or know those that do, so I'm just throwing this out there to see if anyone may have seen one of these units kicking around. This was part of an utility load-control system that used the power...

I signed up for an account at archive.org, but the verification Email isn't coming through. I'll just park a copy of the cruise.com file here in the meantime, and upload once I am able to do so.

Part of a system where the power lines themselves can be used as a communications medium where a utility can control interruptible loads or read instrumentation remotely. The 'LMT' is a very early two-way endpoint (receive-only units were also produced and which are far simpler; some even...

Thought I'd share a project that grew out of some equipment I used to service; these were a few scrapped obsolete boards I squirreled away at some point. It certainly took a while to draw and debug the schematics! That was easy compared to trying to figure out the firmware. :)

I wasn't referring to media lifespan... seems the test engineering group at my work is getting underway with some spring cleaning. Sorry if I get cagey with the finer points at times.

I don't do a whole lot with MS-DOS, actually. This was just something I dumped from some floppies a while back. Good thing I grabbed them when I did, anyway... when I dumped the disks, I poured everything into one folder, and I should have done one folder per disk. I went to look for those...

I wouldn't know, but if you're sure there's a copy somewhere...

I'm going through some DOS files to try and get them organized, and I came across one called 'Cruise Control' by Revolution Software. (cruise.com) It gave you a few options such as the ability to blank the screen after a set delay (30 minutes default) and the ability to set cursor and repeat...

Processor and RAM cards - but these are equally likely to be found in PDP-11 setups.

Universal 18013000 Machine I/O card:

Bootstrap ROM card: (closeup via klapperp)

Power sequencer card:

Documents provided by klapperp:

Since there wasn't much online for this piece of equipment (until klapperp shared a bunch of info), I figure it might be a good idea to start a separate thread to capture any information on this PDP-11 variant so others who are interested in this line of minicomputers can keep their eyes open...

Just a follow-on to another recent thread: the "spare" chassis in post 6 turns out to be a Universal Instruments 8222 controller. The board in the P/S slot is a power-up sequencer which apparently has circuitry similar to that in the standard DEC power supply for the PDP-11. Also partly visible...

Stepped back into the room with the PDPs and looked at the 'spare' chassis - sure enough, it's marked as an Universal Instruments 8222 controller and there's a small transformer right there on the backplane.

Actually, I did a BOM compare and corrected some component values and also changed the part designators to agree with the print. The one zener would be the 1N750, and that was on the input end of one of the comparator stages. I haven't done a detail comparison yet given how closely the...

and here's the completed KiCad file

Sure enough. the board has 'Universal' on the back... thought it was maybe the board house or something. Here I thought it was worthwhile, as I couldn't find any documentation on this board, but all I did was reinvent the wheel

OK - changed the one to S_Spare6, and added "CAUTION: NOT FOR USE ON 22-BIT BACKPLANES"