| 摘要 |
<p>PURPOSE:To shorten the processing time by transferring collectively the contents of a memory to a prescribed area of a picture memory when the input to an input frame is ended. CONSTITUTION:One of plural entry frames of a tablet 1 is defined as an input frame 1a1, and the coordinate data supplied successively from the tablet 1 are fetched. A deciding circuit 5 discriminates the input frames to which those coordinate data belong. When the coordinate data within the frame 1a1 is decided, a converting circuit 3 calculates the address of the bit in a memory 4 corresponding to the relevant coordinate data. Then one word including said bit is fetched, and the bit is set at ''1''. This word is written in the original address of the memory 4. When the input to the frame 1a1 is ended, the overall contents of the memory 4 are collectively transferred to an area 2a1 of a picture memory 2 by a transfer circuit 6. Thus plural rows are transferred collectively with an overhead. This transfer is repeated.</p> |
