| 摘要 |
A bit map display apparatus of this invention includes a bit map memory consisting of a plurality of memory planes, a display controller which can output a window number indicating a displaying window in accordance with display scan, a register, arranged for each plane, for holding bit data for designating a display enable/disable state in units of windows, a selector, arranged for each plane, for selecting one bit of output data from the corresponding register as a mask bit in accordance with the window number indicated by the display controller, and a gate circuit, arranged for each plane, for controlling data read out from the corresponding plane in accordance with the mask bit.
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