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    • 2. 发明专利
    • CHARACTER DISPLAY DEVICE
    • JPH0197986A
    • 1989-04-17
    • JP25504287
    • 1987-10-09
    • ASCII CORP
    • ISHII TAKATOSHIOGAWA DAIKIOMAE SHOZO
    • G09G5/30G09G1/00G09G5/14G09G5/22G09G5/24
    • PURPOSE: To make it possible to extend an attribute function while holding interchangeability with computer software based upon European-American standard specifications by storing pairs of character codes and attribute data in a memory, specifying a character by two character codes or more and recognizing extended attribute data. CONSTITUTION: An area occupied by a. character on the display surface of a CRT display device is allowed to correspond to the size of an area occupied by character codes corresponding to the character in a VRAM 3. In the case of alphanumeric character expressed by an en, the attribute data of one byte is allowed to correspond to the character code of one byte, and in the case of KANJI (Chinese character) expressed by an em, attribute data are allowed to correspond to each of character codes corresponding to two bytes. Attribute data corresponding to the 2nd KANJI character code are used for extended attribute data. Consequently an attribute function can be extended while maintaining interchangeability with computer software based upon European- American standard specifications.
    • 5. 发明专利
    • SYNCHRONIZATION CIRCUIT FOR DISPLAY CONTROLLER
    • JPS6462694A
    • 1989-03-09
    • JP21957787
    • 1987-09-02
    • ASCII CORP
    • ISHII TAKATOSHIOGAWA DAIKIOMAE SHOZO
    • G09G5/32G09G1/00G09G5/12G09G5/38
    • PURPOSE: To make it possible to put images one over the other by comparing the output timing points of synchronizing signals outputted by two display controllers with each other and stopping supplying a dot clock to the controller which has sent out the synchronizing signal earlier by the time difference in output timing. CONSTITUTION: The display controllers 2 and 5 read a VRAM 4 and a VRAM 5 corresponding to dot clocks SDCL and MDCL indicating the display timing of one dot on a display screen, and generate the synchronizing signals needed for display control, and the vertical synchronizing signals SVIN and MVIN of them are supplied to a synchronizing and KANJI (Chinese character) display device 8. The synchronizing and KANJI display device 8 generates a dot clock by a clock oscillator and when it is supplied to the display controllers 2 and 5, the output timing points of the vertical synchronizing signals SVIN and MVIN are compared with each other to perform control so that the transmission of the dot clocks SDCL and MDCL is timed to a graphic screen and a text screen according to the comparison result. Consequently, the images of the two display controllers can be put one over the other.
    • 6. 发明专利
    • CHARACTER DISPLAY DEVICE
    • JPH031186A
    • 1991-01-07
    • JP21957687
    • 1987-09-02
    • ASCII CORP
    • ISHII TAKATOSHIOGAWA DAIKIOMAE SHOZO
    • G09G5/22G09G1/00G09G5/06
    • PURPOSE:To increase the execution speed and to improve the interchangeability of a software by deciding whether a character code fetched by a character code fetching part is data for instructing singly a character or data for instructing the data by >=2, and displaying a character of a KANJI (Chinese character), etc., by a text mode. CONSTITUTION:Whether a character code inputted by a character code fetching part 20 is that which instructs singly a character or that which instructs the character by >=2 is decided by a deciding part 23, and even if a character code of an alphanumeric character and a character code of a KANJI (Chinese charac ter), etc., are mixed in a memory 3, they are discriminated. Subsequently, based on a result of this discrimination, an address generating part 24 generates an address of a character generator 10b, and font data corresponding to the respec tive character codes are read out. Accordingly, even in the case a personal computer of Western standard specifications is used, a character of a KANJI, etc., can be displayed by a text mode. In such a way, the execution can be increased and the interchangeability of a software can be improved.
    • 7. 发明专利
    • SOFTWARE CONTROL ELECTRONIC DEVICE
    • JPH02128231A
    • 1990-05-16
    • JP28288388
    • 1988-11-09
    • ASCII CORP
    • OMAE SHOZOOGAWA DAIKI
    • G06F12/16G06F11/00
    • PURPOSE:To improve reliability by permitting data writing as long as an initial write control signal is inputted after an initialization signal is inputted and preventing the permission of data writing even if the write control signal is inputted in a case excepting this case. CONSTITUTION:When initialization software is performed, the initialization signal is inputted to a write control part 22 in addition to the write control signal and an address signal. Since a write signal is inputted from the write control part 22 to a data storage part 21 in such a case, control data is written in the data storage part 21. When initialization terminates, application software is performed and the write control signal and the address signal are inputted to a control storage part 13 from a central processing unit 14 through a bus 16 in such a case, the write signal is not outputted from the write control part 22, and subsequently, data is not written in the data storage part 21. Thus, the content of the control storage part 13 when a system is initialized is protected, and reliability is improved.