[Coco] Coco-3 power and MPI questions

[tim lindner]

On Wed, Oct 1, 2014 at 8:45 AM, Kandur <k at qdv.pw> wrote:
> 3) What is the slot select switch is actually doing on the MPI?
>      Why do we have to plug the floppy controllers into slot #1,
>       because slot #1 ALWAYS ON? Is there a nice clear schematic
>       on the net somewhere?  Thanks.

It selects which Cartridge port gets the SCS*, CTS* signals.
And it selects which slot will provide the CoC with the Cartridge
interrupt signal.

The switch is also under software control. The physical switch becomes
disabled if it was changed under software control.


-- 
tim lindner