Specifications
+5V
1
-DRIVE
18
SELECT
2
28
3
38
DRIVE
SELECTINT
4
48
S3
FIGURE 7·7. SIDE SELECTION USING DRIVE SELECT
7.7
IN USE ALTERNATE INPUT
-SIDE 0
CT
-SIDE 1
CT
39216·25
This alternate input (pin 16) when activated to a logical zero level enables the Activity LED
and
door
lock latch
if
the
door
is
closed. If
IN
USE
is
low upon deselection, the
door
remains locked. If
IN
USE
is
high
upon
deselection,
the
door
unlocks.
To
install this option, jumper trace D
and
move the shorting plug
at
trace Y
to
the
Z position.
7.8
MOTOR ON WITHOUT SELECTING DRIVE
This option
is
useful
in
disk to disk copy operations. It allows the user to keep the
motor
on
for
all
drives, thereby
eliminating the motor start time. The motor
is
started
on
each drive via an Alternate
I/O
(pin 18). Each drive may
have
its
own MOTOR ON line (Radial
or
Simplexed)
or
they may share the
same
line (Multiplexed). When
the
drive
is
selected, a 1 IlS delay must be introduced or TRUE READY must be monitored before a
read
or
write
operation can be performed.
To
install this option
on
a standard drive, move the shorting plug at trace MS to the MO position.
See
figure 7-8.
7-7