[net.micro.6809] About the expansion interface

sdb@shark.UUCP (Steven Den Beste) (10/14/83)

The select (either switch or software) on the expansion interface is
used to choose which slot gets the two predefined select lines that
the COCO provides to the cartridge. All of the slots are actually on
the bus at all times, but it is assumed that, just as all good hardware
should be, that they are all tristated when not being used. However,
if you want to do your on address decoding, you can access the bus
from any slot anytime you want. This is what the X-pad does.

   Steve Den Beste