| 摘要 |
PURPOSE:To test whether or not display screens of respective computer systems are coincident by producing a CRC testing bit sequence of display screen data with the aid of respective computer systems and transmitting it to a connection controller. CONSTITUTION:When a data comparator 8 of a connection controller 2 executes screen actions, it issues a screen testing request to an output system controller 5 of all microcomputer systems 1 through a communications circuit 14. Responding the request from the comparator 8, the controller 5 produces a testing bit sequence by a CRC system from display screen data, and transmitted to the comparator 8 through a communications circuit 13. The comparator 8 compares the testing bit sequences transmitted from all microcomputer systems, and tests whether or not the display screens of an output system device 4 of the computer systems 1 are equal.
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