Control Data Corporation INFORMATION SYSTEMS TERMINAL II Hardware Maintenance Manual page 98

Read Keyboard Data (Input 01) - This function transfers
data from the keyboard interface to the processor. This
data is valid only when the keyboard ready status is pre-
sent or after receiving a keyboard interrupt.
Load Transmitter Lower Bits (Output 01) - This function
transfers 8 bits of data from the processor to the l2-bit
shift register, which serializes the data to be sent to the
PLATO system. Data should be transferred only when the
transmitter is not active, that is, communication line
request status is present, to avoid losing or destroying
data. This function loads part of the transmit shift
register; it does not initiate transmission or modify the
status of the interface.
Read Touchpanel Data (Input 02) - This function transfers
data from the touchpanel interface to the processor. This
data is valid only when the touchpanel ready status is pre-
sent or after receiving a touchpanel interrupt.
The data format is as follows: This word defines 1 of 16 X
columns and 1 of 16 Y rows (1 of 256 locations). The ori-
gin
X
equals 0,
Y
equals 0 is the lower left corner of the
screen.
Load Transmitter Upper Bits (Output 02) - This function
transfers 8 bits of data from the processor to the l2-bit
shift register, which serializes the data to be sent to the
PLATO system. Data should be transferred only when the
transmitter is not active, that is, communication line
request status is present, to avoid losing or destroying
data. In addition, this function loads data into the
transmit register, initiates the transmission, and drops
the request status condition.
Read Lower
10
(Input 03) - This function transfers the
sett~ng of the lower 8 bits of the ID switches to the pro-
cessor. The 16 ID switches are set to a unique code for
each terminal and sealed at the factory.
Bulk Write/Erase (Video Enable/Disable, Output 03) -
T~~
operation of this function is dependent on Data Bits 0, 1,
and 2 as summarized in table 4-6.
4-36
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