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Write Inhibit (TC194)
When active, this output line indicates the tape unit is not
ready for writing. 'Write inhibit' ensures no writing is
initiated by the tape control until tape is up to speed
(200 ips) and/or until the minimum interblock gap has
been reached.
Ground and dc Power Lines
Ground (TC 136)
This line supplies a ground connection to the field tester
and to terminating networks located in the terminator
block.
+
12 (TC132)
This line supplies
+
12 volts to the field tester and to
terminating networks in the terminator block.
- 12 (TC170)
This line supplies - 12 volts to the field tester.
Cables
IBM will supply the cables shown in Figure 5 to the
maximum lengths specified. All cables must be ordered
8
through the IBM sales representative and by the appro-
priate cable group number only. IBM part numbers re-
lating to cables are listed for design information only.
In the interest of safety, all IBM machines shipped to
the customer have been equipped with grounded cord
plugs. No other type of plug will be supplied by IBM.
If
any machine in a group is grounded, all other machines in
the group must be grounded. Grounded machines must be
placed so it is impossible to touch simultaneously a
grounded machine arid an ungrounded machine, electrical
equipment, metal cabinet, etc.
Connectors
IBM will supply the connectors and components shown in
Figure 6. All parts must be ordered through the IBM sales
representative and by the appropriate part or bill of
material number only. See Figures 7, 8, and 9 for
connector schematics and pin assignments.
Drivers and Terminators
Figures 10-16 show transistor circuits used to drive,
receive, and terminate the lines between the tape unit and
its control unit.
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