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2.3.5
TERMINATOR
The resistor network that is used to terminate all input signals is inserted in or removed from a
socket on the PWB. Network impedance is 132 Ohms provided by a 220-0hm resistor to +5V
together with a 330-0hm resistor to DC ground as shown in Figure 2-6. Each Model FDD1 00-5 Disk
Drive is shipped with a terminator installed.
+5V
220n
SIGNAL
0------4..------a
330n
GROUND
0 - - - - -.....
Figure 2-6. Termination Configuration
2.4
INTERFACE SIGNALS
A diagram of the Model FDD100-5 Disk Drive interface signals is shown in Figure 2-7, and the inter-
face signal timing requirements are shown in Figure 2-8.
2.4.1
INPUT CONTROL LINES
Input control signals are carried by eight lines; one of which is optional.
2.4.1.1
Drive Select Lines. There are four Drive Select lines: DS1 (J1-10), DS2 (J1-12), and
DS3 (J 1-14) are standard, and DSO (J 1·6) is optional. A low (true) level on anyone of these lines
allows the controller to communicate with the disk drive assigned to that line. During all commun-
ication with the disk drive, the line must remain true because all transmitters and receivers are gated
2-7
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