PDP-12 at the RICM

[Fred Cisin]

>  The 8086 had four segment registers:
> 	CS	- Code segment, used with IP register
> 	DS	- Data segment
> 	SS	- Stack segment, used with SP and BP registers
> 	ES	- Extra segment, used with DI for string instructions as
> 		  destination (DS:SI as source)
>  You could override instructions dealing with memory with any of the
> segment registers:

If you were writing an emulator, what would you have it do if an interrupt 
occurred while in a REP operation with a segment override?

Just how accurately should an emulator match the behavior of the emulated 
processor?