Maybe the BIOS on such a machine hides the hardware difference well so that most legacy programs can get input from the USB keyboard through the modified BIOS. Any direct keyboard hardware access is possibly no longer supported on such a machine.
Eduard Bloch wrote:
Wait, wait, don't the modern BIOSes have emulation mode for common legacy hardware? I cannot believe they would abolish all the support for non-USB-aware operating systems, this would make all the stuff like boot managers and required DOS tools unuseable.
-- "Free software is not for free." Kaz Sasayama <Kaz.Sasayama@HyperLinuxJP.com>; Screen Name: kazssym Hyper Linux Systems (Hypercore Software Design, Ltd.) <URL:http://www.hypercore.co.jp/>