Ignoramus23626 wrote:

If I bought it, I would junk the old control even if it was not yet
broken.

First, electronics that is that old would not be reliable. Second,
this is a very old and obsolete control, compared to the PC based
controls (Mach3 and especially EMC2).


That is your choice, but you can't repair the electronics without
step by step instructions. There are 80 year old pieces of electronics
still in use, and a good tech can keep them working.

--
You can't have a sense of humor, if you have no sense.