30 Dec
2009
30 Dec
'09
5:49 p.m.
If I load a value into AX, and then do an out
instruction with AL, the
whole of AX seems to still appear on the data bus, something like:
MOV AX,055AAh
OUT 022,AL
It looks like to me that the whole of AX is actually getting put out,
No big deal.
I assume that was the 80186.
How was the timing of the 80188? (did it also try to do anything with
AH?)