9fans archive / 1995 / 09 / 37 /    prev next

From: Ken Yap ken@syd...
Subject: b.com floppy driver patch for fast machines
Date: Mon, 4 Sep 1995 20:47:15 -0400

|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.