Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!bloom-beacon!eru!hagbard!sunic!news.funet.fi!hydra!cc.helsinki.fi!tmottonen
From: tmottonen@cc.helsinki.fi
Newsgroups: comp.windows.ms
Subject: Re: XGA and Windows/bus mastering under 286
Message-ID: <1991Feb1.114749.4735@cc.helsinki.fi>
Date: 1 Feb 91 11:47:49 GMT
References: <859@nih-csl.nih.gov> <1991Jan24.132327.8830@gpu.utcs.utoronto.ca> <1991Jan28.100703.4680@cc.helsinki.fi> <1991Jan30.045751.3520@disk.uucp>
Organization: University of Helsinki
Lines: 29

In article <1991Jan30.045751.3520@disk.uucp>, rob@disk.uucp (Rob Miracle) writes:
> In article <1991Jan28.100703.4680@cc.helsinki.fi>, tmottonen@cc.helsinki.fi writes:
>> In article <1991Jan24.201315.647@sbcs.sunysb.edu>, altman@sbstaff2.cs.sunysb.edu (Jeff Altman) writes:
>> <...>
>> > First of all XGA is only a Micro Channel product.  It is 
>> > Bus Mastering, ships in the standard configuration with
>     ^^^^^^^^^^^^^
> 
>>     I've heard that the XGA adapter requires a 386SX or better
>>     machine. Any idea why ? 
> 
> Simple, the XGA adapter is a BUS master microchannel card.  Bus mastering is
> only supported under 80386 processors.

    Well, let me quote the IBM Catalog of MicroChannel Adaptors
    on the IBM 16-bit SCSI bus master adapter:

    	"A 16-bit bus master adapter that provides expandability
    	 for all PS/2 computers with Micro Channel bus. ..."

    So it would seem that you can have bus mastering under 80286
    processors after all ;-)

    Teemu.
    -- 
                             _________
	Teemu Mottonen	    |         |	internet: tmottonen@cc.helsinki.Fi
    University of Helsinki  |         |   bitnet: TMOTTONEN@FINUH
   Dept.of Computer Science |_________|	  decnet: HYLK::TMOTTONEN