| 摘要 |
PURPOSE:To contrive a higher speed in processing for vertical-to-horizontal conversion, by a system wherein font data of horizontal-direction images in a Chinese character generator are converted into font data of vertical-direction images by a DMA controller using a vertical-to-horizontal converting circuit, and the font data thus obtained are developed in a line buffer. CONSTITUTION:The vertical-to-horizontal converting circuit 4 is so operated that horizontal-direction image data are successively written 8 times by one byte at a time, and are successively read 8 times, whereby vertical-direction image data are sequentially obtained by one byte at a time. The DMA controller 3 comprises a Chinese character address register 31, a line buffer address register 32, a line buffer base address register 33, a lengs register 34, a lengs counter 35, a lengs decoder 36, a controlling circuit 33 and an address counter 38. The horizontal-direction image data in the Chinese character generator are converted into vertical-direction image data by the controller 3 by using the circuit 4, and the data thus obtained are developed in the line buffer. |
