Nippon Electric Co., Ltd.

Tokyo Broadcasting System, Inc.

Yoitiro Hoshi

Masao Inaba

Takaya Morita

A memory write-in control system provides for each dot a plurality of color designating bits representing color information for the dot as well as a set of mask command bits corresponding to the respective color designating bits. The memory content is changed in accordance with the color designating bits only when the mask command bits are at one logic level. The memory bit content is unchanged when the mask command bits are at the other logic level irrespective of the color designating bits.

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Tokyo, Japan

Yoitiro Hoshi