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From: johnl@iecc.cambridge.ma.us (John R. Levine)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Intel 302 Board Unix Jumper?
Message-ID: <9105242200.AA17303@iecc.cambridge.ma.us>
Date: 25 May 91 02:00:52 GMT
Sender: Postmaster@iecc.cambridge.ma.us
Organization: I.E.C.C.
Lines: 16
In-Reply-To: <1991May23.083345.2273@idx.com>

In article <1991May23.083345.2273@idx.com> you write:
>Can anyone tell me the function of the "UNIX" jumper on my Intel 302
>Motherboard?

It's documented perfectly well in the motherboard manual, if not in the
302 manual.  When the jumper is not in the unix position, the ROM BIOS is
mapped both in the bottom 1MB and at the top of the 16MB address space.
When it is in the unix position, the BIOS is only mapped in the bottom 1MB.

The non-unix position might be useful to some versions of OS/2, maybe, but in
most cases it makes no difference.  I acually loaded up my 302 with 16MB of
RAM but I wasn't able to use the very top chunk of memory, no matter which
position the jumper was in.

Regards,
John Levine, johnl@iecc.cambridge.ma.us, {spdcc|ima|world}!iecc!johnl