                                LPS Drive AT PCB Jumper Configurations


DS      SP      DM      DESCRIPTION

1       0       0       Master drive - in PDIAG mode (using DASP to check for a Slave)
1       0       1       Master drive - in 40/80AT mode (using DASP to check for a Slave)
1       1       0       Master drive - in PDIAG mode (without check DASP for a Slave)
1       1       1       Master drive - in 40/80AT mode (without check DASP for a Slave)
0       0       0       Slave drive - for compatibility with drives using the standard PDIAG mode
0       0       1       Slave drive - in ProDrive 40/80AT mode (without usingPDIAG line)
0       1       0       Self-seek mode
0       1       1       Self-seek mode

        1 = jumper installed
        0 = jumper NOT installed

DS (Drvie Select) Jumper
When daisy chaining two drives on the AT-Bus interface, configure one drives as the Masster,
the other as the Slave, using the DS jumper pins. Factory default is DS jumper installed as
the Master (Drive 0). To configure a drive as the Slave (Drive1), remove the DS jumper.

Note: The order in which drives are connected in a dasiy chain has no-significance.

SP (Slave Present) Jumper
In combination with the current DS jumper setting, the SP jumper implements one of the two
possible configurations:

- When the drive is configured as a Master (DS jumper installed), the SP jumper informs the
drive that a Slave drive is present. The SP jumper should be installed on the Master drive
only if the drive does NOT use the Drive Active/Slave Present (DASP) signal indicate its
presence.

- When the drive is configured as a Slave (DS jumper NOT installed) , the SP jumper enables the
self-seek test. When power is appled to the drive with the self-seek test enabled, the drive
continuosly performs a series of test, including: RAM/EPROM tests, Verify disk test, Self-seek test,
during which the drive executes seeks in a butterfly pattern, and Write/Verify test, to test the
drive's read Read/Write electronics after every seek. During the self-seek test, the LED remanis on
while the test proceeds without error. If the test encounters a seek error, the test terminates and
the LED flashes continuously until the SP jumper is removed.

DM (Drive Mode) Jumper
When DM jumper is installed, the drive is in the ProDrive 40/80AT mode and can communicate with the
ProDrive 40/80AT hard disk drive. In this mode, the drive does NOT use the PDIAG signal to control
Master/Slave communications. The configuration of the DS and SP jumpers determines whether it is the
Master or the Slave Drive.


                      LOGICAL ADDRESSING FORMATS FOR QUANTUM HARD DISK DRIVES

During the AT System CMOS setup, you must enter the drive type for the disk drive. All Quantum drives
support the translation of its physical drive geometry parameters such as cylinders, heads, and sectors
per track, to a logical adressing mode. The drives can work with different BIOS drive-type tables of
the various host systems. You can choose any drive type that does not exeed the capacity of the drive.
The following table gives the logical parameters that provide maximum capacity on Quantum disk drives:

--------------------------------------------------------------------------------
Drive Model             Cylinders       Heads   Sectors/Track   Capacity(Mbytes)
--------------------------------------------------------------------------------
ProDrive  40AT            965             5          17              41.996
ProDrive  80AT            965            10          17              83.994
ProDrive 120AT            814             9          32             120.029
ProDrive 170AT            968            10          34             168.509
ProDrive 210AT            873            13          36             209.185
ProDrive 330AT            959            15          45             331.430
ProDrive 425AT           1021            16          51             426.566
--------------------------------------------------------------------------------
LPS  52AT                 751             8          17              52.294
LPS  84AT                 611            16          17              85.094
LPS 105AT                 755            16          17             105.144
LPS 120AT                 901             5          53             122.248
LPS 240AT                 723            13          51             245.427
--------------------------------------------------------------------------------
GoDrive 40AT              820             6          17              42.824
GoDrive 80AT             1024             9          17              80.216
--------------------------------------------------------------------------------

If is not possible to use the numbers listed above, you must choose a drive type that
meets the following requirements:

- Its total number of sectors must be less than or equal to the total number of sector
  on your drive

- Its capacity must be less than or equal to the capacity of the drive

To calculate a drive's total number of sector, multiply the number of cylinders, heads,
and sectors per track:
                Cylinders x Heads x Sector/Track x 512 Bytes/Sector
Capacity:       ---------------------------------------------------
                            1.000.000 Bytes/Megabytes

Note: Do NOT low level format Quantum AT-Bus hard disk drives.

