[Coco] Question about the PIA RAM Size input

[Darren A.]

Hi all,

Does anyone know if any harm can be done by reprogramming the Data Direction 
Register of PIA 2 such that the RAM Size input becomes an output?  Since 
this line is often jumpered to either GND or +5V, what happens when the PIA 
is trying to drive the line?

The RAM Size input is on the 'B' side of the PIA, and the 6821 datasheet 
says:

"As outputs, these lines are compatible with standard TTL and may also be 
used as a source of at least one milliampere to directly drive the base of a 
transistor switch."

Darren

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