[Coco] Question about the PIA RAM Size input
darccml at hotmail.com
Mon Apr 30 11:27:50 EDT 2007
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
"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
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