10 Dec
2005
10 Dec
'05
1:17 a.m.
On 12/9/2005 at 6:44 PM Jim Leonard wrote:
MOV SS,AX
MOV SP,DX
...to switch the stack to somewhere else, and the 8088 was supposed to
disable
interrupts after the MOV SS for the next instruction (MOV SP). However, I
read
somewhere that early versions of the 8088 didn't honor this (or at least
didn't
That's true.
What I'd like to know is: What revisions of the
8088 were susceptible to
this?
I don't know--Intel got it fixed pretty quickly, though. But I never quit
adding that STI before a stack segment load.
Here's another dumb question: When I open up one
of my XTs, why does my
8088-1
have an AMD logo on it?
AMD has had a cross-licensing agreement with Intel since 1976. It gets
renewed every few years; I think the current one is due to expire in 2011.
In spite of the lawsuits that get tossed back and forth between the two,
it's a mutually beneficial arrangement.
Cheers,
Chuck