MPI 40 Series - Disk Change (Optional Output); Two Sided (Optional Output); Alternate I;O Pins; Power Interface

is active it disables the write operation. For single sided
drives (Model 41), a "flippy" option for write protect is
available which allows double sided diskette usage in single
sided drives.
3.5.2.9 Disk Change (Optional Output)
This is an optional output which becomes true (logical zero) in
the selected drive when the READY signal goes false. This line
is reset either when the drive goes ready again or when it is
deselected.
3.5.2.10 Two Sided (Optional Output)
This is an optional output which becomes true (logical zero) in
the selected drive when a two sided diskette is installed and at
least one INDEX pulse is sensed. The Model 42 utilizes double
sided diskettes.
3.5.3 Alternate 1/0 Pins
In the standard configuration there are unused pins available for
the optional configration of the drive as mentioned in Section 6,
OPTIONAL CONFIGURATION. Pins 2, 4, 6, 8, 12, 16, 18, 24, 28, 30, 32, 48 and
50 on connector Jl are unassigned in the standard configuration.
3.5.4 Power Interface
P3
Pin
1
2
5
6
The Model 40 Series requires DC power of +24V and +5V. +5V is used
for the electronics and +24V is used for the stepping motor,
spindle drive motor, write current, and the door lock and head load
solenoids. See Figure 3-3 for the connection, and Table 3-2 for
pin assignments. The MPI Model 40 Series does not require AC
power, so an AC power connector and 50/60 HZ adjustments on the
pulley and belt are not required.
Table 3~2: Connector P3, Pin Assignments
Max
DC Voltage
Tolerance Current
Ripple
+ 24 VDC
+ 10% 1.25A typical
100 mv P -
p
-
+ 24
VDC
Return
+
5
VDC
+ 5% 1.00A typical 50 mv P - P
-
+
5 VDC
Return
3-16