Newsgroups: comp.os.minix
Subject: Re: Minix on an 8088
References: <468d9268.0106281024.65933e92@posting.google.com> <3B40F64B.9A039243@optonline.net> <slrn9k2se8.m5o.pino+comp_os_minix@mud.stack.nl> <11c8d5bc.0107040615.5821292c@posting.google.com>
Organization: Minix
Message-ID: <c9or8s5lt531vr0f1igto7pmo2@stereo.pch.home.cs.vu.nl>
From: philip@pch.home.cs.vu.nl (Philip Homburg)
Date: Wed, 4 Jul 2001 16:57:10 +0200
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In article <11c8d5bc.0107040615.5821292c@posting.google.com>,
Claudio Tantignone <c_tantignone@hotmail.com> wrote:
>pino+comp_os_minix@dohd.org (Martijn van Buul) wrote in message news:<slrn9k2se8.m5o.pino+comp_os_minix@mud.stack.nl>...
>> It wouldn't be too hard to make minix swap to expanded memory first, instead
>> of swapping to disk. Hmm..
>
>I remember that in 286 you can control the A20 line to access the
>extended memory. You need to made some I/Os. Returning from virtual to
>real mode was a reset in 286. I played a bit with that in Minix 1.2
>over 286, using extended memory like an extended disk cache.

Expanded memory is different. It is supposed to be accessed using bank
switching. Some address space above 640K is reserved to access the pages that 
are selected.




					Philip Homburg
