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公开(公告)号：US4271479A
公开(公告)日：1981-06-02
申请号：US844151
申请日：1977-10-20
CPC分类号： G09G5/222 , G06F13/372 , G06F13/4213 , G06F3/153
摘要： Disclosed is a display system having one or more display terminals, each of which includes a base unit which acts as a display and supports a keyboard for operation as a keyboard/display terminal, the terminal in turn interfacing with a plurality of features connected thereto. The features can be quite independent of the display, such as a card reader, or can be an operationally integral part thereof, such as extended capacity buffer operating jointly with the main buffer of the display, or can be interactive with the display, such as a selector pen or program function keyboard. The base unit and the features receive transmissions from a controller via a feature bus-out in the base unit and transmit to the controller via a feature bus-in in the base unit. The base unit also provides priority control in permitting features to respond to a controller poll. Commands are also directly addressable to the base unit and features by the controller, with the base unit performing interface functions between the controller and the features such as parity checking and time out error reporting.
摘要翻译： 公开了具有一个或多个显示终端的显示系统，每个显示终端包括作为显示器的基座单元，并且支撑键盘作为键盘/显示终端操作，所述终端又与连接到其上的多个特征进行接口。 这些特征可以非常独立于诸如读卡器的显示器，或者可以是其可操作地整合的部分，例如与显示器的主缓冲器共同操作的扩展容量缓冲器，或者可以与显示器交互，诸如 选择笔或程序功能键盘。 基本单元和特征通过基本单元中的特征总线接收来自控制器的传输，并通过基本单元中的特征总线传送到控制器。 基本单元还提供优先级控制，以允许特征对控制器轮询进行响应。 命令也可直接通过控制器寻址到基本单元和功能，基本单元在控制器和功能之间执行接口功能，如奇偶校验和超时错误报告。
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公开(公告)号：US4429306A
公开(公告)日：1984-01-31
申请号：US300880
申请日：1981-09-11
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.
摘要翻译： 公开了一种方法和装置，用于在字符发生器存储器的公共区域中寻址包含两种或多种语言共有的符号的字符发生器存储器。 正在显示的特定语言特有的符号被存储在字符发生器存储器的多个特殊符号区域之一中。 与公共区域相邻的特殊符号区域之一被标识为默认符号区域。 通过将显示字符代码的高位比较与比较位来选择字符发生器存储器的适当的特殊符号区域，以确定是否将字符发生器存储器的不同特殊符号区域替换为与 公共区域。 如果比较位指示字符发生器的不同特殊区域被替换，则显示字符代码的高位不直接用于寻址字符发生器存储器，而是被替换位替换以访问该特殊符号区域 所显示的语言是独一无二的。
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