[Coco] Y-Cable

[Kandur]

Before starting to make one, I better ask, 
if anyone has one of those kicking around?
I'm thinking of making a powered one, by cutting
the power leads to the cartridge slot, inserting 
diodes at the cut and feeding it from the end.
I'll need 3 sockets on it for the FDC, HDC and 
for the LR-Tech Super Board. 
Have someone here done this before?
BTW, anyone knows why are 2 button batteries 
in the LR-Tech Super Board?
http://qdv.pw/coco/?p=168 

Kandur