From: Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Automatic EOI in DJGPP
Date: Sat, 21 Oct 2000 00:03:00 +0100
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To: djgpp AT delorie DOT com
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"TeddyLam" <teddylam AT geocities DOT com> wrote:

> I'm trying to write a Bit Error Rate test program for PC. I've generated a
> 33.6k hardware interrupt by the timer counter 0 on port 0x040h. Since there
> is only one interrupt exist during the test process, I want to improve the
> performance by configuring the 8259 PIC to enable the Automatic EOI mode
> such that I dont need to issue EOI everytime my ISR is being called. This
> should be quiet significant because issue EOI means you need to write to an
> IO port 0x020h.

Maybe I miss the point of what you are trying to achieve.

There are already serial comms libraries written for DJGPP that you
could use to do a BERT by send/receive a known data stream.  What
benefits do you expect from doing this the hard way?