[Coco] CoCoNet is CoCo 3 ready

[Torsten Dittel]

I hardly remember that using corresponding POKE (65345?), you could 
instruct the MPI, from which slot to select the ROM, overriding the 
MPI-switch setting. However, I don't remember what happened on a 
"button" reset. Would it fall back to the one selected by the 
MPI-switch? Any difference to that behaviour on a 6809 "opcode" reset or 
on powering the CoCo only down and up again (MPI stays powered on)?

Does anyone remember what happened with the I/O addresses with an MPI? I 
assume even using an MPI, it was not possible to have two or more 
cartridges sharing the same I/O adress(es). I/O was always a kind of 
"wired or" (like a Y-cable), no chance to independently select a single 
(or a combination of) slot(s) for I/O (e.g. select ROM from slot 3, I/O 
from slot 1 and 2, but not 0 & 3).

By the way, what is the CoCo3 MPI-patch doing? Does it have any impact 
on MPI-behaviour, if a CoCo3-modified MPI is connected to the CoCo2?

Thanks for clarifying,
Torsten