[Coco] SLENB line behavior

[Robert Gault]

RETRO Innovations wrote:
> Maybe it's best to get some clarification on the usage of the line.
>
> I assumed SLENB is to be considered a "wired-or" line.  Namely, any device on an
> MPI can pull the line low if needed, but all devices are to pull it weakly high,
> so that multiple devices can share the line.
>
> Am I considering it correctly?  Or, is it designed so that only 1 cartridge can
> support SLENB in a system?
>
> Jim
>

You can find a service manual and a service diagram at
http://www.colorcomputerarchive.com/coco/Documents/Manuals/Hardware/Multi-Pak%20Interface%20Service%20Manual%20(26-3024)%20(Tandy).pdf

http://www.colorcomputerarchive.com/coco/Documents/Manuals/Hardware/Multi-Pak%20Interface%20Schematic%20Diagram%20(Tandy).pdf

The above should be one line addresses. You can at least see how the MPI was 
designed.

Robert