| 摘要 |
PURPOSE:To depict a vertical line at a high speed by changing prior to delineation the bit position designating field of the command code of the bit operating command dynamically. CONSTITUTION:The bit operating command included in the bit operating part is altered at the command change part. Then, after the first word is loaded into the CPU register, the bit operation is performed at the bit operating part. The so-operated word is then stored in the original address. Then it is judged whether the operation has come to an end. If the word is the first word, the delineation is terminated. If otherwise, after the next memory address is computed, the process returns to the word load and the above operation is repeated until the operation is terminated. The procedure enables the vertical line to be delineated at high speed since it is unnecessary to judge the bit position and the depiction program is executed with the minimum number of steps once the command code is altered. |
