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From: jca@pnet01.cts.com (John C. Archambeau)
Newsgroups: comp.sys.ibm.pc
Subject: Re: INFO needed for MFM, SCSI, IDE drive
Message-ID: <2592@crash.cts.com>
Date: 9 May 90 04:16:21 GMT
Sender: root@crash.cts.com
Organization: People-Net [pnet01], El Cajon CA
Lines: 34

shim@zip.eecs.umich.edu (Sam Shim) writes:
>>>2. Can we install MFM (controller + disk drive) as drive 1 and 
>>>   SCSI (controller + disk drive) as drive 2 on the same machine 
>>>   (386) ? 
>> 
>>Drive 2 meaning the drive 2 in your BIOS?  If that's the case, no.  The reason
>>being that SCSI is not supported in any motherboard BIOS chip (only exception
>>are those odd ball motherboards that have an on-board SCSI port, and there are
>>a few of them).  The SCSI host adaptor will have its own on-board BIOS and how
>>the logical drives are mapped varies greatly from manufacturer to
>>manufacturer.
>
>I think what Kent meant was whether the SCSI drive can be a second drive on
>a computer with a ST-506/412 MFM controller and disk drive if the SCSI drive
>is connected to a SCSI controller card and I believe it is possible.
If by second drive you mean logical drive two, no, it doesn't work that way. 
Logical drive two would be the second drive on your ST412/506 MFM controller.
 
Logical drive 2 is also configurable from your motherboard's BIOS setup.  BIOS
chips are only aware of ST412/506, IDE and in some cases ESDI depending on the
BIOS maker and whether its a 286 or 386 BIOS.

SCSI is NOT supported by any motherboard BIOS chip out there.
 
     // JCA

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