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From: jsims@vuse.vanderbilt.edu (J. Robert Sims)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Using IDE and MFM Drives together
Message-ID: <1991Jun3.170610.3170@vuse.vanderbilt.edu>
Date: 3 Jun 91 17:06:10 GMT
References: <3200@ria.ccs.uwo.ca> <1991Jun2.045900.15627@msuinfo.cl.msu.edu> <3224@ria.ccs.uwo.ca>
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In article <3224@ria.ccs.uwo.ca> wlsmith@valve.heart.rri.uwo.ca (Wayne L. Smith) writes:
>In article <1991Jun2.045900.15627@msuinfo.cl.msu.edu> draper@buster.cps.msu.edu (Patrick J Draper) writes:
>>Set
>>the BIOS type on the primary MFM drive to what it's supposed to be, and
>>the second hard disk bios setting to NOT INSTALLED.
>
>I thought that IDE controllers needed the bios info.  If you set the 2'nd
>drive bios info to -NOT INSTALLED-, how does the IDE controller/drive
>know what's going on?  How does the computer know what's going on?
>
>>It also requires that there is ONE partition on the MFM drive, as the
>>IDE will take the letters D:, E:, etc.
>
>When I had an RLL / SCSI combo going, I found that the partitions were
>interleaved, ie the SCSI responded with C, E, G... and the RLL had the
>D, F, etc.  Just what determined that (bios or DOS or something else)?

The documentation I've seen said that the 1st drive would be identified
by C, E, F, G, ... and the second drive would be D, H, I, J..., not 
interleaved.  This sort of makes sense; the DOS partitions comes first,
and then the extended partitions.  Each extended partition's drives
are listed together.

Rob