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SECTION VIII.
OPERATOR'S CONSOLE
CONSOLE FUNCTIONS
Type 220-1 Console
The 220-1 console operates in two modes:
1.
2.
Peripheral Mode -
Functions as a peripheral device which utilizes a read/
write channel under program control.
The program illuminates the TYPE
indicator and causes the keyboard to become effective when data is to be
entered.
Printouts are under program control only.
Logging Mode -
Functions as a logging typewriter which is logically
disconnected from the central processor to allow the operator to make
essential notes about the operation of the program.
The console is switched from one mode to the other by pressing the LOG push-button. This
button is illuminated only when the console is in the logging mode.
The typewriter keyboard is
effective only when either the LOG or the TYPE indicator is illuminated.
PERIPHERAL MODE
When the LOG indicator is turned off, the console typewriter may be operated under pro-
gram control as a peripheral input/ output device.
The console control allows the typewriter to
be addressed by a program through a read/write channel for typing out messages from the pro-
gram or for entering parameters into the central processor.
In the peripheral mode, the type-
writer keyboard (except the Carriage Return key) is not effective unless the TYPE indicator is
illuminated.
LOGGING MODE
At the risk of delaying the program, the operator may log while a program is running.
In
the logging mode, the typewriter operates off-line and appears busy to all central processor in-
structions.
Thus, if the program attempts to address the typewriter while the operator is log-
ging, it will stall.
The program can test whether the console typewriter is busy by executing a
PCB instruction.
The logging mode is effective only when the LOG indicator is illuminated.
This button is
either illuminated or turned off each time it is depressed.
Illuminating the LOG button does not
cause the read/write channel to be released (if one has been assigned).
Type 220-3 Console
The 220-3 console (see Figure 8-1 for illustration of console control panel) operates in
three mutually exclusive modes:
1.
Peripheral Mode -
If
the STOP indicator is not illuminated, the console
typewriter operates under program control as a peripheral device utilizing
a read/write channel.
Except for the L key and the Carriage Return key,
the typewriter is not effective unless the TYPE indicator is illuminated.
8-3
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