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Gotcha.  I honed in on the 290 as it has Commodore software available and I have a Commodore sitting right here with nothing better to do.  Honestly the old timer controller is more than I need.

The CM15A is USB.
I believe it also has its own message format.
I do not know anything about a C64 but I doubt it does.

The CM15A will interface with a C64? 

Just keep in mind.
The CM15A  is a USB interfaced controller
I believe the serial port CM11A was after the CP290.
Somewhere I saw the serial massages information and many where the same from the CP290.

Skip the CP290 and go with the CM15a.

Thanks for the welcome and the links!  I have a Commodore 64 but I have yet to locate a CP290 with the C64 cable.  I do have the software ready.  I may just need to build an RS232 interface and get an IBM 290 if I can get one affordably.

I did replace the Varta backup battery in the Homeminder so I’m curious what kind of time I’ll get out of it.  I’d like to get the service manual for it too.  I can’t find the video IC part number and the heat sink is firmly epoxied on there..

Welcome Tapes1982.  Nice to have some new blood around here! 

Back in 1985 I had a GE Hominder and thought it was the coolest thing since sliced bread. IIRC, the major problem I had was that any power failure longer than 10 seconds basically resulted in a factory reset requiring a new setup and schedules.  Plugging it into a UPS would solve that but most UPS's have a filter that attenuates or block X10 signals.  After trying the X10 CP-290 and ActiveHome controllers of the day I went to a  JDS Stargate that I still use today.

Tapes 1982
Welcome.
You maybe interested in a few of these sites.
Jeff has a great X10 devices they developed and troubleshooting site.   https://jvde.us/x10-troubleshooting/     https://jvde.us/
X10's wiki is also a good place to look at.  https://kbase.x10.com/wiki/Main_Page
I still have some X10 addresses in my Insteon setup. Along with the XTB-IIR and XTBM
X10 Powerflash triggered by the problem output on my oil burner. To flash a Socket Rocket with a Red LED bulb and sound a Large Powerhorn.
Many very knowledgeable members here and will gladly assist you.

I just got into X10.  It was suggested by a coworker who is still using it.  Granted I like older technologies and I ran immediately for all the old simulated woodgrain controllers etc.. I did purchase a new lamp module and a 3 pack of relay switches for my outdoor lights.  Happy to say the current lamp module works perfectly with the GE Relax LED bulbs I like.  Dimming and all.  I’m just perusing this forum for some other ideas.  I actually have a working GE Homeminder on our TV set and an X10 alarm clock radio from Stanley.  I plan to make a sprinkler timer for the hose when it gets warmer and control it with The Timer.  Everyone I mention X10 to thinks it’s quite cool and loves that it can exist independently from a smartphone and the internet.  I think if someone like Technology Connections did a video on it there would be an upswing in younger interest.

I made a YouTube video of the Homeminder in action.

I can't be the only person still using this stuff.

I'm still using it!  I have downsized my X10 setup accordingly as I have downsized into a smaller, temporary dwelling after getting married.  Once our new house is built, I plan to upscale the HA dramatically and shall still be using X10 in it (though not exclusively).  I have a huge tote and a few other boxes of X10 gear that's currently not being used.

Or, is it all working so well that nobody is asking questions?

Yes!  We're still using X10 PLC and RF here, Jeff Volp's incredible XTB-IIR repeater and XTB-232 "real time" CM11A replacement, and some custom scripts coupled with the ActiveHome Scripting "SDK".  The latter are running on a Windows Server 2003 server, which is still running for various other reasons, but I also got the AHSDK working on Windows 11.  All still working very reliably, and I just haven't had anything new to share nor ask.

I do still visit the forum every couple of weeks just to see what's new and have had the same sentiment as you.