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From: Carlo <mail AT bo DOT uf>
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Subject: Re: why inportb and outportb are so time expensive ?
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Date: Sat, 11 Dec 2004 14:55:08 GMT
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Eli Zaretskii wrote:
> 
> 
> On what OS?
> 
> Also, can you give more details, like how much time each call to
> inportb/outportb takes?
My application runs on a dos machine (MS-Dos 6.0) with a i386sx 
processor @ 33 Mhz clock, with cwsdpmi r5.
One program loop takes about 1 mSec, 75% of this millisecond spent for 
inportb and outportb (with an average of 30/40 calls to that functions). 
Without any of these calls the program runs up to 10 times faster.

Carlo