| 摘要 |
PURPOSE:To simplify the circuit constitution and to reduce the processing load of software by supplying the signals received from each memory and the signal received from a single input/output address through a gate and actuating plural CRT with the signals received from those gates. CONSTITUTION:A memory address 11 includes a system memory 12 and memory areas 12a-12d matched with each other in response to the CRT10a-10d respectively. The signals received from an input/output address 13 and those signals received from the areas 12a-12d are supplied to AND gates 14a-14d corresponding to the CRT 10a-10d. Then the output signals received from the gates 14a-14d are sent to CRT substrates 15a-15d for control of the CRT 10a-10d. In other words, the signals that decoded the areas 12a-12d of four CRT and the signals sent from the address 13 are gated and one of three CRT is selected.
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