Sharp PC-1211 Service Manual page 6

6
In the case of manual operation of the pocket computer, the instruction code (key code) is written
into the RAM in the display chip (input buffer) after information is put through the keyboard and
converted into the instruction code by the CPU I, then this instruction code (display, at this case)
is transfered to the CPU II via the transfer buffer.
As
the CPU II receives this instruction, the CPU II
then decodes this instruction (display, at this case) and executes display processing. Upon the
completion of this processing, it is then notified to the CPU I, then the CPU I confirms the comple-
tion of the task by the CPU II before terminating their jobs.
CPU Il
Ex: Actions of CPU I and CPU II at the time of key data entry.