| 摘要 |
PURPOSE:To attain clipping of an arbitrary area on a graphic display by providing two kinds of bit map memories. CONSTITUTION:When a CPU 1 write data in a VRAM 2, a mask circuit 4 by a chipping brain memory 3 works. When a flag for operating the mask circuit is significant, the contents of the clipping brain memory 3 are inverted. In such a way, the clipping of an arbitrary area on a graphic display can be executed. |
