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From: j@bonnie.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: FreeBSD Hardware Status
Date: 17 Aug 1995 10:33:01 +0200
Organization: Private U**x site, Dresden.
Lines: 37
Message-ID: <40uurt$8mt@bonnie.tcd-dresden.de>
References: <DDAL0I.D75@seas.ucla.edu> <40orni$6os@park.uvsc.edu> <jcaron-1508951330120001@mon2-09.planete.net> <40rpom$sa1@park.uvsc.edu>
Reply-To: joerg_wunsch@uriah.heep.sax.de
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Terry Lambert <terry@cs.weber.edu> wrote:
>] I guess I'll have to learn to read 80x86 code... [and find a disassembler].
>
>No need to do that.
>
>They examine the equipment word at 40:10h. For all systems after
>the XT, bits are decoded as:
>
>0 Boot diskette drive installed
>1 math coprocessor
>2 mouse port on system board <-- XXXXXXXXXXXX
Well, that's an excellent idea!
>This information is filled in via the post routine and would be
>retrived in a VM86() environment (which we don't have one of) by
>calling INT 11h (post code is returned in AX).
We don't need vm86() for this. The BIOS data area is being preserved.
>It's also amusing to not that by examining words 40:00, 40:02,
>40:04, and 40:06, one can find the serial port address ranges
>for the first four serial ports, and 40:08, 40:0A, 40:0C for
>the first three printer ports (both convolutes operations in
>the probe code for the respective drivers).
It's also amusing to note that the lpt driver is just examining the
40:08 ff. fields if the `port' tag in the config file is being
specified as `?'.
:^)
--
cheers, J"org private: joerg_wunsch@uriah.heep.sax.de
http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)