AT PIC questions

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2 total messages Started by Robert J. Manley Fri, 06 Nov 1992 17:22

#604

Author: Robert J. Manley
Date: Fri, 06 Nov 1992 17:22

17 lines
949 bytes

Hi netters.

Some easy question for those with their tech ref manuals nearby.
For the AT PICs (8259) I need to know:

	1. slave IO port address
	2. slave INT vect range set by BIOS
	3. EOI sequence (master/slave or slave/master)

Thanks in advance.

Robert.
-- 
# Robert J. Manley,  rjm@dretor.dciem.dnd.ca		#
# NTT Systems Inc., Toronto, Ontario, CANADA		#
# #include <std_disclaimer.hpp>				#
# OS/2 : OS :: Blue Jays : MLB				#

Re: AT PIC questions

#627

Author: David J. Krause
Date: Wed, 11 Nov 1992 18:29

25 lines
1175 bytes

In <6587@dciem.dciem.dnd.ca> rjm@dciem.dciem.dnd.ca (Robert J. Manley) writes:

>Hi netters.

>Some easy question for those with their tech ref manuals nearby.
>For the AT PICs (8259) I need to know:

>	1. slave IO port address
Ports A0h and A1h are to the slave 8259 what ports 20h and 21h are for the
master 8259.

>	2. slave INT vect range set by BIOS
The interrupts generated by the slave 8259 are 70h - 77h.  BTW, 70h is the
high-speed timer tick interrupt.

>	3. EOI sequence (master/slave or slave/master)
I believe that you send an EOI to slave then master, but I could not 
guarantee that.

Good luck,
  Dave

This has got to be some of the hardest to find info out ther on the PC.

krause@lobby.ti.com

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