Control Data Corporation INFORMATION SYSTEMS TERMINAL II Hardware Maintenance Manual page 104

the processor. A read keyboard data function trans-
fers the data and resets this status bit. This sig-
nal also generates the keyboard data ready interrupt.
• Data. Bit 4, Touchpanel Data Ready - This bit set
indicates that the touchpanel interface has detected
a touch and is saving the X/Y information. A ready
touchpanel data function should be executed to
transfer the data and reset this status bit. This
signal also generates the touchpanel data ready
interrupt.
• Data Bit 5, Timeout - This bit set indicates that an
I/O cycle to an external device on the parallel
channel was not completed in the allotted time. The
hardware aborts the I/O cycle and sets this status
bit. The program should, after every I/O cycle to
external devices, check this bit to know whether the
completion of the I/O was due to normal or abnormal
circumstances.
This bit clears automatically at the beginning of
the next external I/O cycle (and sets again if it
fails) •
• Data Bit 6, RESET Switch - This bit carries informa-
tion on the status of the RESET switch: a 0 when it
is being held down and a I under normal conditions.
(The reset pulse acting on the hardware is indepen-
dent of the duration of the switch depression,
therefore, the terminal could be running while this
swi tch is down.)
• Data Bit 7, Bulk Busy - This bit monitors the
activity of the hardware Bulk Write/Erase circuit.
It is a I only while the hardware Bulk Write /Erase
is ta king place.
Load Serial Control (Output 07) - This function transfers
control parameters from the processor or the serial channel
interface.
Read Communication Line (Input 08) - This function trans-
fers 8 bits of information from the PLATO receiver to the
processor. This data is valid only when the Communication
Ready status bit or interrupt is set. This status/
interrupt condition is removed automatically at completion
of the transfer cycle.
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