IBM Aptiva M50/M51
(250-0440/0445)       HD Specifications/Settings      Faxback Doc. # 18893

Quantum 1080AT Specifications/Settings:

The following values are used to set the PC/AT CMOS Table:

CMOS Values

Cylinders            2112
Heads                  16
Sectors                63
Write Precomp       65535*
Landing Zone         2112

The Quantum does not require Write Pre compensation.  Your CMOS setting
should be set to reflect that this feature is not enabled.  A value of
65535 is a number that many BIOS manufactures use to disable this feature
if the value 'none' is not present. 

Jumper Settings

The 1080AT has three drive mode jumper options; DS, SP and CS.  To
configure the drive as:

    The MASTER of a two drive configuration or as the only drive:
    Jumper DS only.  SP and CS open, or not jumped.

    A SLAVE drive in a two drive configuration:
    Remove any jumpers across DS, SP or CS. 

   A MASTER drive in a two drive configuration if the SLAVE drive does not
   use DASP: 
   Jumper DS and SP only.  CS not used - DO NOT install a jumper across
   this position. 

The SP jumper is only used when the second drive in a two drive
configuration does not support DASP.  DASP (Drive active / drive 1 present)
is a CAM (Common Access Method) defined signal that indicates the presence
of a second drive, DASP is used during power on initialization and after a
reset.  Prior to this definition, products were introduced which did not
utilize this method to detect the presence of a second drive.  The SP
jumper is only used on the MASTER drive, with the DS jumper, when the
second drive does not support DASP.

The CS (Cable Select) jumper is only used in systems that support this
feature.  Cable Select allows for each IDE disk drive to be jumped the same
and the position on the cable determines the ID.  This requires special
cable and both drives on the interface would have to support this feature.


(LR/BKL-02/08/96)

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