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From: bet@ecsvax.UUCP (Bennett E. Todd III)
Newsgroups: net.micro.pc
Subject: Re: 8259 PIC
Message-ID: <1414@ecsvax.UUCP>
Date: Mon, 14-Apr-86 12:11:56 EST
Article-I.D.: ecsvax.1414
Posted: Mon Apr 14 12:11:56 1986
Date-Received: Sun, 20-Apr-86 18:10:48 EST
References: <84@uscvax.UUCP>
Reply-To: bet@ecsvax.UUCP (Bennett E. Todd III)
Distribution: net
Organization: Duke University Computation Center
Lines: 17

In article <84@uscvax.UUCP> nadji@uscvax.UUCP (Behzad Nadji) writes:
>"One can send a EOI to 8259 PIC by writing a 20H into port 20H."
>
>Where can I get more detail on this?

The PC Tech Ref has, between the BIOS listing, the circuit diagram, and
the I/O space and memory maps, enough detail to allow you to figure out
where the 8259 is and how to get at it; the Intel Component Data Catalog
(one of the quasi-freebie spec books) has detailed programming
information on the chip. Between the two I was able to write a working
asynch interrupt handler, with help from a friend.

-Bennett
-- 

Bennett Todd -- Duke Computation Center, Durham, NC 27706-7756; (919) 684-3695
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