IRQ? 
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 IRQ?

HI , Is the IRQ just mean int 8>f  ?
thanks


Sat, 24 Aug 2002 03:00:00 GMT  
 IRQ?

Quote:
>HI , Is the IRQ just mean int 8>f  ?

Not necessarily, this depends on how the interrupt
controller (PIC) is programmed.
The default setting on PC's for IRQ 0 - 7 is int 8 - f.
As int 10h through 6xh were defined for all kinds of
uses on the PC, on the AT, the 2nd PIC (for IRQ 8 -15)
is programmed to use int 70h - 77h.

On 286+ systems, int 8 - f conflict with the new
exceptions. This is not too bad for DOS applications,
but a problem for PM applications.
Therefor in PM, both the PICs are programmed to
use other int for IRQ 0 - 15. E.g. I use int 20h through
int 2Fh.

H



Sat, 24 Aug 2002 03:00:00 GMT  
 
 [ 2 post ] 

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