On Feb 19, 2010, at 9:10 PM, MCH wrote:

> I'm stumped by the "-1" on the end. I don't see any provision for that
> in the docs. What does that do?

Most assemblers for most CPUs allow arguments that are numeric values  
to be arbitrarily complex numeric/boolean expressions, often involving  
symbols.  The expressions are evaluated at the time of assembly/ 
compilation to a simple constant, that goes into the final instruction.

BillW


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