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In article <1993Jan4.021737.8624@news.cs.brandeis.edu> dan@chaos.cs.brandeis.edu (Dan Schwarz) writes:
>From: dan@chaos.cs.brandeis.edu (Dan Schwarz)
>Subject: Help me get my CMOS drive settings right
>Date: Mon, 4 Jan 1993 02:17:37 GMT
>Here's the deal. I own an old (1988) NCR 386/16 system that I am trying to
>get running with an IDE hard disk and floppy drive. I have no manuals or
>other documentation for the system. The drive and HD card test out OK.
>
>The system has a setup progam in ROM (I believe it uses a Phoenix BIOS)
>that allows me to select one of 47 drive types. 
>
>* it does not allow me to enter my own HD drive geometry.
>* the parameters do not show on screen so I don't know if they are the
>  standard AT drive types or NCR's own variant.
>
>My HD is a Maxtor 7080A, which accepts several different configurations. An
>old system like mine should work with type 35.  When I choose type 35,
>the system hangs at self-test. WHen I choose type 1, the system boots from
>floppy but the hard disk shows garbage data (of course; type 1 is totally
>incorrect for this HD.)
>
>I'm looking for a way out of this problem short of buying a new motherboard.
>Can anyone recommend one of the following:
>
>* A software driver program (pref. shareware or freeware) that will let me
>use this drive with my system?
>
>* A way to hack the CMOS drive settings directly, to enter the drive geometry
>directly into the system, bypassing the SETUP program?
>
>* The proper NCR drive type which is equivalent to an IBM AT drive type 35?
>
>Any help would be much appreciated! Thanks.
>
>-Dan
>

I doubt if your mother board can drive the IDE due to the sector translation 
on the drive which does not match any priviously asigned hard disks. 7080A 
has 981 cyl., 10 hds., 17 sec., (specified for DOS, in fact it has 1170 
cyl., 4 hds., and 36 sectors). The address of hard drive table can be found 
at 0000:0118-0000:011B. Hard drive table hase 16 byte for each entry:
cyl	2 Bytes
hds	1 "
-	2 "
cmp	2 "
-	5 "
zone	2 "
sec/trk	1 "
-	1 "
find the parameter and see which one matches. using the other configuration 
for your HD, reduces the size too. So be brave, change your mother board! 
Then you will have type 47, user specified type!!
Good luck.

--
Peace and Prosperity!
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