Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software

[Chuck Guzis]

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