Separate font and attribute display system
    2.
    发明公开
    Separate font and attribute display system 失效
    独立显示和配置显示系统

    公开(公告)号:EP0395916A3

    公开(公告)日:1991-04-10

    申请号:EP90106768.6

    申请日:1990-04-09

    CPC classification number: G09G5/39 G09G5/024 G09G5/36

    Abstract: A method and circuitry for using two buffers containing video display information is shown. One buffer contains character mask or dot image information, while the other buffer has two portions, foreground and background, which store attribute information. In non-­compatible write operations attribute information stored in registers is written to the attribute buffers when mask information is written to the first buffer. In compatible write operations the attribute value is written to the foreground attribute buffer and zero is written to the background buffer, while an OR'ed value of the attribute value is written to the first buffer. In non-compatible read operations the value in the first buffer may be obtained or a CRC value may be generated on the entire character cell. The CRC value can be compared with similar CRC values developed on the character mask of interest to determine if a character is present in the cell. In compatible mode read operations the value in the foreground or background buffer is selected based on the value in the first buffer. In display drive operations a similar selection is made and the value supplied to the circuitry driving the display.

    Abstract translation: 示出了使用包含视频显示信息的两个缓冲器的方法和电路。 一个缓冲区包含字符掩码或点图像信息,而另一个缓冲区有两个部分,前台和后台,存储属性信息。 在不兼容的写入操作中,当将掩码信息写入第一个缓冲器时,存储在寄存器中的属性信息被写入属性缓冲器。 在兼容的写入操作中,将属性值写入前台属性缓冲区,并将零写入后台缓冲区,同时将属性值的OR值写入第一个缓冲区。 在不兼容的读取操作中,可以获得第一缓冲器中的值或者可以在整个字符单元上生成CRC值。 可以将CRC值与在感兴趣的字符掩码上开发的类似CRC值进行比较,以确定字符是否存在于单元格中。 在兼容模式读取操作中,前台或后台缓冲区中的值基于第一个缓冲区中的值进行选择。 在显示驱动器操作中,进行类似的选择,并且提供给驱动显示器的电路的值。

    Separate font and attribute display system
    9.
    发明公开
    Separate font and attribute display system 失效
    Bildanzeigesystem mit getrenntem Schriftsatz und Bilddarstellungs-Attributen。

    公开(公告)号:EP0395916A2

    公开(公告)日:1990-11-07

    申请号:EP90106768.6

    申请日:1990-04-09

    CPC classification number: G09G5/39 G09G5/024 G09G5/36

    Abstract: A method and circuitry for using two buffers containing video display information is shown. One buffer contains character mask or dot image information, while the other buffer has two portions, foreground and background, which store attribute information. In non-­compatible write operations attribute information stored in registers is written to the attribute buffers when mask information is written to the first buffer. In compatible write operations the attribute value is written to the foreground attribute buffer and zero is written to the background buffer, while an OR'ed value of the attribute value is written to the first buffer. In non-compatible read operations the value in the first buffer may be obtained or a CRC value may be generated on the entire character cell. The CRC value can be compared with similar CRC values developed on the character mask of interest to determine if a character is present in the cell. In compatible mode read operations the value in the foreground or background buffer is selected based on the value in the first buffer. In display drive operations a similar selection is made and the value supplied to the circuitry driving the display.

    Abstract translation: 示出了使用包含视频显示信息的两个缓冲器的方法和电路。 一个缓冲区包含字符掩码或点图像信息,而另一个缓冲区有两个部分,前台和后台,存储属性信息。 在不兼容的写入操作中,当将掩码信息写入第一个缓冲器时,存储在寄存器中的属性信息被写入属性缓冲器。 在兼容的写入操作中,将属性值写入前台属性缓冲区,并将零写入后台缓冲区,同时将属性值的OR值写入第一个缓冲区。 在不兼容的读取操作中,可以获得第一缓冲器中的值或者可以在整个字符单元上生成CRC值。 可以将CRC值与在感兴趣的字符掩码上开发的类似CRC值进行比较,以确定字符是否存在于单元格中。 在兼容模式读取操作中,前台或后台缓冲区中的值基于第一个缓冲区中的值进行选择。 在显示驱动器操作中,进行类似的选择,并且提供给驱动显示器的电路的值。

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