[Coco] OT: TRS-80 Model I repair info

[Christian Lesage]

I've been given two TRS-80 Model I computers that I would like to 
repair. Both are fitted with 16kB RAM, Level II Basic on a daughter 
board, a numeric keypad, an extra switch on the right-hand side and an 
extra daughter board (in addition to the one with the Level II ROMs). 
Several wires are connecting the extra switch and daughter board to 
different points on the logic board. Unfortunately, some of those wires 
have been snatched or unsoldered. I believe I could make at least one of 
the the computers work if only I knew where the wires are supposed to go 
to.

I do not know if the extra switch and daughter board were added by a 
Radio Shack technician or a computer hobbyist.

Anybody knows a bit about the Model I? Is there some resource with 
information about this kind of modification?

Thanks a lot,

Christian