Re: Intel DP965LT BIOS keyboard input crashes

On Tue, 26 Aug 2008 01:14:55 UTC, "Horst Franke" <nospam@invalid> wrote:

In news:176uZD2KcidF-pn2-wdiie1mi4gUR@xxxxxxxxxxxxxxxx Bob Eager wrote:

In news:176uZD2KcidF-pn2-SQlPmDl0xj1F@xxxxxxxxxxxxxxxx Bob Eager
wrote:

Not necessarily. Most operating systems (except DOS) don't use the
BIOS. They access the keyboard directly via I/O port 61H.

OK Bob, then please provide some more details!
HOW would You access the keyboard W/O BIOS support?
What do You use: PIO (Programmed I/O) or Memory Mapped I/O?

Programmed I/O (with interrupt support) via ports in the range 60H to
63H. I have done this many times. I wrote a tiny operating system that
fitted on a floppy, that did just that.

OK, and WHO provides for that interrupt support?
I can only think of BIOS to provide this!

The BIOS is useless for a multitasking operating system as it is
single threaded and non re-entrant. It is used mainly for
configuration and initialisation purposes these days; all disk,
screen, keyboard etc. I/O is done via a mixture of programmed I/O via
ports, and memory mapped I/O.

OK, but remind, WHO else than BIOS will provide for that support!
The motherboard has no intelligence = that's part of BIOS!
Unplug the BIOS chip and watch what will happen!

You really need to read about this somewhere. The interrupt support is
provided by the operating system.

--
Bob Eager
Use the BIG mirror service in the UK:
http://www.mirrorservice.org

.

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