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Clarification on Memcal issues



I've been looking through the archives and there seems to be some conflicting 
info, or maybe I'm just confused...

What I'm interested in clarifying is how the memcal affects the cylinder 
select and pinouts.
I know that the memcal has a cylinder select function built into it, and that 
there are also some cylinder select functions in the code.  What affects what 
here?  Does the cylinder select in the memcal only effect the limp home mode, 
whereas the code affects the 'normal' timing mode?  Or will, say a 6cyl 
memcal in a v8 with v8 code, ALWAYS have the ECM calculating rpm for 6cyl?
Does the Memcal determine rpm calculations, whereas the code determines 
timing (i.e., dwell angles, etc.)?
The reason I ask is that I have ONE v8 memcal and half a dozen v6 memcals, 
one of which I already have a ZIF socket on with another half dozen chips for 
easy burning.  I don't want to 'wear out' my v8 memcal and ECM socket with 
constant removal, erasing, burning, and reinsertion's.  I'll bend a pin 
eventually, Believe Me!
I'll save the pinout question for later.
Thanks,
Ted

PS. I'm talking '730v6 memcal in a '727
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