[Coco] SuperIDE behavior question

[RETRO Innovations]

With the borrowed SuperIDE I have here, I am seeing something 
interesting when I pair it with another cartridge.

It appears that SuperIDE (and I assume the mini-Flash) assert /SLENB on 
any access from $ff50 to $ff5f (when the unit is configured to reside at 
$ff50-$ff59).  This happens even when the unit is not selected on an 
MPI, and I have verified that SCS is not activated on the slot that the 
SuperIDE sits on.

Has anyone else seen this behavior?  It is easily recreated, so I am 
pretty sure it is by design.

Dealing with this in the MPI might be difficult.  I seems like it would 
require routing the SLENB lines through the CPLD, requiring more IO than 
I might have available.

Anyone with an idea of why a SUperIDE would do this when it is not 
selected (via SCS)?

Jim



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