Messages in this thread | | | From | Bodo Eggert <> | Subject | Re: Paused I/O versus regular I/O | Date | Sun, 27 Nov 2005 01:52:49 +0100 |
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Jean Delvare <khali@linux-fr.org> wrote:
> Could anyone tell me what the difference is between "paused" I/O > (inb_p, oub_p and friends) and regular I/O (inb, oub and friends)? I > understand that the former includes some delays here and there, but how > do I know when to use the paused variant, and when the non-paused > variant is OK?
AFAIK, some old hardware needs it. The original ISA bus speed was 4.77 MHz, and AT changed it to 8 MHz. Some chips needed extra delays to compensate, and those chips stayed around for a long time.
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