发明授权
- 专利标题: Display control apparatus employing bit map method
- 专利标题(中): 采用位图法的显示控制装置
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申请号: US928005申请日: 1986-11-07
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公开(公告)号: US4837564A公开(公告)日: 1989-06-06
- 发明人: Shinji Ogawa , Haruhiko Tsuchiya , Tsutomu Araki , Hiroshi Aoki , Hiroshi Yamamoto
- 申请人: Shinji Ogawa , Haruhiko Tsuchiya , Tsutomu Araki , Hiroshi Aoki , Hiroshi Yamamoto
- 申请人地址: JPX Yamato
- 专利权人: Panafacom Limited
- 当前专利权人: Panafacom Limited
- 当前专利权人地址: JPX Yamato
- 优先权: JPX60-96436 19850507
- 主分类号: G06F3/153
- IPC分类号: G06F3/153 ; G09G5/02 ; G09G5/30
摘要:
A display control apparatus using a bit map method, for controlling character attribute data, such as an underline and an overline. In the apparatus, a line control memory is arranged to preset information of character attributes in units of lines of character fonts to be transferred to a video memory; in a DMA transfer sequence of a DMA transfer controller. Character attribute control is performed in a character controller for each line transfer according to the attribute information read out from the line control memory, and expansion of a character font from a character font memory area to the video memory can be simultaneously performed with processing of character attributes from the line control memory.