5 Dec
2009
5 Dec
'09
7:45 p.m.
On 5 Dec 2009 at 11:29, Fred Cisin wrote:
. . . and, it didn't behave the way the 8088
behaved if you had an
interrupt occur during execution of an instruction with multiple
"prefixes", such as a segment override along with a REP with the
"string" instructions.
Early versions of the 8088 did have the problem that they'd "forget"
all but one prefix when the return from interrupt was made, but I
think later ones didn't.
Just as early versions of the 8088 didn't mask interrupts for one
instruction time after a MOV SS,... instruction.
The V-series made it into some early laptops and portables because of
the lower power consumption. In particular, when the CPU was in a
"halt" state, power consumption dropped to about 1/10 of that of the
running state.
--Chuck