Table of Contents
Advertisement
Medalist Family AT Product Manual, Rev. A
2.4.2 Dual-drive emulation jumper block J6
With jumpers installed on pins 1 and 2, and pins 3 and 4 of jumper block
J6, you can install this drive as both C and D drives simultaneously.
Under dual-drive emulation, capacities are as follows: for the ST31220A,
each subdrive has a capacity of 528 Mbytes for a total of 1,056 Mbytes;
for the ST3780A, each drive has a capacity of 360 Mbytes for a total of
720 Mbytes.
Installation in this manner causes the drive to appear to your computer
as two drives, master and slave, so an additional slave drive cannot be
added.
Note. When the drive is configured to support dual-drive emulation, both
emulated drives respond as one to any power-management com-
mand.
2.4.3 Master/slave configuration
Your drive is shipped with a jumper installed in a spare location on pins 1
and 3 of the master/slave jumper block. If you are installing only one
drive, you can leave the jumper installed on pins 1 and 3, or you can
remove all jumpers from the jumper block.
You can install up to two drives in a standard AT system. If you are
installing two drives in your system, configure one drive as the master
and the other as the slave according to the following guidelines:
• To configure the drive as a master with a slave present, install a jumper
on pins 3 and 4 only of the master/slave jumper block of the master
drive.
Note. If both the master and the slave are ST31220 family drives,
you do not need to install a jumper on pins 3 and 4. This is
because the master can detect the presence of the slave using
the DASP– signal on the AT interface cable. If the drives in
your application do not implement the DASP– signal, install the
jumper on pins 3 and 4 of the master/slave jumper block on the
master drive only.
• To configure the drive as a slave, install a jumper on pins 1 and 2 only
of the master/slave jumper block on the slave drive.
With the aid of a special interface ribbon cable, the cable select option
allows you to determine the master and slave according to where the
drives are plugged into the cable. Cable select is described in more detail
in Section 2.5.
19
Advertisement
Table of Contents
