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1.19.14 Stepper Power From Drive Select (OS)
This option allows the user to remove D. C. power from the stepper motor using drive select, which
results in lower stand-by current consumption.
The Stepper Power From Drive Select option is implemented by installing OS, and cutting HL.
1.19.15
Stepper Power From Head Load Line (HL)
This option supplies power to the stepper motor when the head load line goes low (true). This results
in lower stand-by current consumption.
This option is factory installed. OS must be removed for proper operation.
1.19.16
Head Load Alternate Output Pad Option C
This option allows the userto load and unload the head load solenoid (optional) and, along with the HL
and
Y
options, enables the stepper motor and lights the Activity L.
E.
D., respectively. Head load is
accomplished by connecting both option pads C located near interface connector P13.
1.19.17
Radial Head Load Signal, Options A,
B,
and
X
By selection of the appropriate combination of the A,
B,
or
X
jumper, the user can use either Drive
Select or Head Load to activate the Activity L.
E.
D. and Lever Lock Solenoid option (see Figure 1-10).
DIR±..._
OIl.~L..+
10
SlOE. \ -
W';ll..-
U,>
c==
I(,cr!!:'
0,
y
r # ) O . O ' - - - -_ _
--<>
POR.-
(i>
POR-
L504
D~
':iTI>El<.l+
H~;=r---
....-_uS_'O_z,
----ll
~getDID
, . - - _ _ _ _ _ _
POR+
+SV
+5V
+ov
I~O
\'::>0
R4
RO
';f,~
5iDE
~--<1;i=:)'O'------------t-t--+_···_·,
~:14 ,,"'_---O-,5~1
- - - - - - - - - - 1 - - + - + - - - - - - - '
ISO
tr~'------"'<1~
,.......L';,OZ.
11
: 1'.03
z.
US )-'-1
---------+----~
+5V
+5V
14
14
I~
U~:, 4e04
5
Figure 1-10
Radial Head Load Signal
1.19.-18
Inhibit Write When Write Protected (WP)
This option is used to lock out the write gate when a write protected diskette is installed.
Inhibit Write VVhen Write Protected is factory installed.
1.19.19 Allow Write When Write Protected
(N
P)
This option allows the controller to write on any diskette, whether or not is is write protected.
1-21
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