Question about PASM 'MOV' instruction and 'WC' effect
Consider the two following instructions...
mov AAA, #10 WC
mov BBB, #511 WC
The Manual (v1.2) states on page 311:
If the WC effect is specified, the C flag is set to Value’s MSB.
What does this mean for Immediate values? To my mind it is ambiguous. It might mean that bit  is copied into the C flag (because immediate values are only 9 bits long). Or else it could mean that the immediate value is implicitly extended to 32 bits and then bit  is copied into the C flag. But is that extension signed or unsigned?
After instruction AAA, what is C? I think probably 0.
After instruction BBB, what is C?
When the source is NOT an immediate value this is of course not ambiguous at all.