Re: AT PIC questions

Article View: alt.msdos.programmer

Article #627

Back to alt.msdos.programmer Previous Next

#627

From: 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

Technical Details

Message-ID: <1992Nov11.182916.3837@mksol.dseg.ti.com>

Path: arc1-ca.pugleaf.net!sparky!uunet!sun-barr!cs.utexas.edu!csc.ti.com!tilde.csc.ti.com!mksol!krause

References: <6587@dciem.dciem.dnd.ca>

Show Full Headers

Complete Article Headers

Newsgroups: alt.msdos.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!sun-barr!cs.utexas.edu!csc.ti.com!tilde.csc.ti.com!mksol!krause
From: krause@mksol.dseg.ti.com (David J. Krause)
Subject: Re: AT PIC questions
Message-ID: <1992Nov11.182916.3837@mksol.dseg.ti.com>
Keywords: AT PIC 8259 master slave EOI
Organization: Texas Instruments Inc
References: <6587@dciem.dciem.dnd.ca>
Distribution: na
Date: Wed, 11 Nov 1992 18:29:16 GMT
Lines: 25

Reply to Parent Message