I'm in the process of trying to decide what to do with a 130XE I bought pretty cheap-- sold cheap because the seller, upfront, explained that it has bad RAM. Specifically, every other block is red during the self-test. Both the OS and ANTIC chips get pretty warm, as well.
However, I decided to compare the innards with my other two working 130XE systems, and I discovered that only one of the working systems has a mainboard similar to the befuddling 130XE on my bench.
If you look at the attached pics, the broken 130XE is the same mainboard as the one I labeled "Type 2," including the two wires you'll see.
However, the other 130XE, which is seen in "Type 1" not only is missing the wires, but ALSO has a jumbled mess up by the SIO port. Yet it works just fine.
I was just wondering what anyone else makes of all this...?
Submitted for your perusal,