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NOTE
This is a strappable feature
with the Motor Control 3 input
signal line.
DISK CHANGE
TYPICAL INTERFACE
CHARACTERISTICS
Lines between the controller and the drive
have the following characteristics:
V
out
True
=
+
0.4 volt maximum at
lout
= 48 milliamperes, maximurn
Figure 3-1 contains the electrical interface
characteristics. Figure 3-2 contains the control
and data timing requirements.
This strappable feature provides a true (low)
signal to the interface when Drive Select is
activated if the drive has gone from a Ready
to a Not Ready condition while deselected.
This line is reset on the true-to-false transition
of Drive Select if the drive has gone to a
Ready condition.
V
out
False
+
2.4 volts minimum open
collector at
lout
= 250
microamperes, maximurn
TWO-SIDED
This option is available only on Model
TM848-2E. True (low) indicates that a two-
sided diskette is installed.
3.5
D. C.
POWER
D. C. power is supplied to the drive through a
six-pin AMP connector, J2, mounted on the
circuit board. The rnating connector, not
+5V
+TRUE
i - - - - - - - l
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7438 OR
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L
EQUIVALENT
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_ _ _ _ _ _ _ ...J
DRIVER
TRANSMISSION
LINE~
10 FEET
150 OHMS
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RECEIVER
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FIGURE 3-1
ELECTRICAL INTERFACE CHARACTERISTICS
3-6
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