From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Mon,  4 Sep 1995 20:47:15 -0400
From: Ken Yap ken@syd.dit.csiro.au
Subject: b.com floppy driver patch for fast machines
Topicbox-Message-UUID: 1f99cdbc-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19950905004715.u0VglaAS8AexJD1D4Nppjm9uQq52OCpxUpRx_F9-40U@z>

|For what it's worth, the Crynwr packet drivers for DOS use an inb from
|the keyboard controller to establish a reasonably constant delay.  I
|gather this is because the keyboard controller runs at something like 7
|MHz on virtually every motherboard.  It runs at a higher clock rate on
|PS/2s, but apparently it's reliable on ISA, EISA, and ISA/PCI
|motherboards.

Well, it isn't actually anything to do with the keyboard controller,
just that that port is a "harmless" one to read and that most ISA buses
run at 8-12 MHz, regardless of CPU speed.