Specifications

-DRIVE SELECT 4 x
32
-DRIVE SELECT 3 )(
30
-DRIVE SELECT
2 )(
28
-DRIVE SELECT 1
OPTIONAL
SIDE SELECT
FROM DRIVE
SELECT
ALTERNATEJ
1/0 PINS ~
-MOTOR ON
26
+5V
2 2
---+)(~-4---i"~::'== 4-= ==,\
~)(E----_.~ = = == == =~:
6 ___ 6 ____ "
~wr-~-~It~------~I
18 ::
---iE~----18 II
II
II
i
I
i
I
1
I
I
1
2·
V~ 11~
en en en en
o 0 0 0
..
II
Ii
NOTE
.... STANDARD TRACE
.,,111 DELETED TRACE
...... ADDED OR JUMPERED
TRACE
MS
-.+- ...... -MOTOR ON
If the MOTOR ON line is
multiplexed, the terminator
pack at U9 must be remov-
ed from each drive except
the last on the line. The
current requirement is
the
+ 24 Volt current times
the number of drives on
the line that have MOTOR
ON
active.
39216-27
FIGURE 7·9. MOTOR ON BY OPT. MOTOR ON AND DRIVE SELECT CIRCUIT
7.11 RADIAL READY
This option enables the user to monitor the READY line of each drive on the interface. This can be useful in detec-
ting when
an operator has removed or installed a diskette in any drive. Normally, the READY line from a drive is
only available to the interface when it is selected.
To install this option on a standard drive, the following traces should be deleted or added:
a. Cut trace RR.
b. Cut trace
R.
c. Add a wire from R to one of the Alternate I/O pins.
NOTE
One of the drives on the interface may use pin 22 as its READY line, therefore steps band c may
be eliminated
on this drive. All the other drives on the interface must have their own READY line,
therefore steps
band c must be incorporated.
Figure 7-10 illustrates the circuitry.
7-9