| 摘要 |
A code conversion circuit especially suited for, but not limited to, use with a video display apparatus of a type in which the screen is arbitrarily divided into plural domains defined by horizontal scan lines, Xi, and vertical section lines, Yj. A random access memory (RAM) used in the system stores local codes defining the video symbols to be displayed in the various domains on the screen. The code conversion circuit permits selective modification of the addresses applied to the RAM so that a picture element normally displayed in domain Xi Yj can, in turn, be displayed in a domain Xm Yn. Means are further provided for inverting the order in which the local codes read from the RAM are applied to the video display. Hence, the code conversion circuit is capable of rotating an image to be displayed about the center point of the display screen.
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