发明授权
- 专利标题: Addressing system for a multiple language character generator
- 专利标题(中): 多语言字符发生器的寻址系统
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申请号: US300880申请日: 1981-09-11
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公开(公告)号: US4429306A公开(公告)日: 1984-01-31
- 发明人: George C. Macauley , William F. Nemecek , Robert W. Roefer
- 申请人: George C. Macauley , William F. Nemecek , Robert W. Roefer
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: G06F3/153
- IPC分类号: G06F3/153 ; G06T11/20 ; G09G1/02 ; G09G5/24 ; G09G1/00
摘要:
A method and apparatus are disclosed for addressing a character generator memory containing symbols common to two or more languages in a common area of the character generator memory. Symbols which are special to the particular language being displayed are stored in one of a plurality of special symbol areas of the character generator memory. One of the special symbol areas contiguous with the common area is identified as a default symbol area. The proper special symbol area of the character generator memory is selected by comparing the high order bits of a display character code with compare bits to determine whether a different special symbol area of the character generator memory is to be substituted for the default area contiguous with the common area. If the compare bits indicate that a different special area of the character generator is to be substituted, the high order bits of the display character code are not directly used to address the character generator memory but are replaced by substitution bits to access that special symbol area unique to the language being displayed.