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3.1
GENERAL
SECTION 3
OPERATION
In a system using all 2236 Terminals (no 2226 type User Ter-
minal), Console Input/Output is assigned to 2236 Terminal #1.
This is
set by default and CANNOT be changed.
Use of the other 2236 Terminals
can only be accomplished under program control.
3.2
ACCESSING THE TERMINALS
3.2.1
GENERAL
As described in section 2.2, the 2236 MXC-1 controller has a
BOARD address, used to enable the controller.
Once the controller is
selected, communication to the terminals is accomplished by specific
control sequences using $GIO or PRINT statements.
$GIO is preferred.
Do not confuse the method of selecting the controller with the method
of selecting a terminal.
Since most installations use a 2226 as Console Input/Output and
the 2236 Terminals for software applications, the method of accessing
the terminals in this configuration is described.
This method can be
used in any configuration, however, by changing the high order address
bit in the device select statements.
There are specific control sequences which must be performed in
order to communicate with the terminal.
The control commands may be
sent to the MXC-1 by PRINT statements or $GIO statements.
$GIO is
preferred.
IMPORTANT - IF PRINT STATEMENTS ARE USED, THE CONTROL
CODES MUST BE FOLLOWED BY A SEMICOLON(;).
Otherwise, the MXC-1 will
"Hang" .
C-5
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