Personal computer with multiple independent CRT displays of ideographic and/or ASCII characters having loadable font memory for storing digital representations of subset or special characters
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United States of America Patent
Stats
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Sep 4, 1990
Grant Date -
N/A
app pub date -
Aug 22, 1985
filing date -
Aug 22, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plurality of language display control cards are provided for insertion into the motherboard of a personal computer, each card having connector means to which a CRT display and a keyboard may be connected. Each card controls its display independently of the others so that different data may be displayed on each display screen. A display control card includes a font memory for storing the digital video representations of ideographic characters of a standard code, and an ASCII memory for storing the digital video representations of ASCII characters. In addition a loadable font memory is provided for storing the digital video representations of characters which are not commonly used characters of a language but may be frequently used in a particular application. The outputs of the three memories may be serially interspersed so that the CRT may display ASCII, or ideographic characters or a mixture of both. To reduce the size of the font memory, a translator memory is provided for converting non-sequential numbers representing the characters of a standard internal code used by the PC into a sequence of consecutive numbers for addressing the font memory.
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