Address manipulation circuitry for a digital computer
    2.
    发明授权
    Address manipulation circuitry for a digital computer 失效
    数字电脑地址处理电路

    公开(公告)号:US3699528A

    公开(公告)日:1972-10-17

    申请号:US3699528D

    申请日:1970-02-16

    Applicant: BURROUGHS CORP

    CPC classification number: G06F12/10

    Abstract: The overlay of information from the computer memory to a peripheral memory and its return to the computer memory are facilitated by a unique format for original and copy descriptors. The copy descriptors have a first field that designates either a base address or the location of its original, and a second field that designates an index. The original descriptors have a field that designates the base address. The copy descriptors are automatically generated from their originals. When a copy descriptor is retrieved, the first and second fields are added to form the absolute address if the first field is the base address. If the first field is an original descriptor location, the base address of the original descriptor and the index of the copy descriptor are added to form the absolute address. Upon overlay, the copy descriptors to be updated are sensed by comparing their base value with the base value of the array to be overlaid. They are updated by substituting the original descriptor location for the base address and the original descriptors are updated by substituting the peripheral memory address for the base address. Upon return of the overlaid information to the computer memory, only the original descriptor must be updated.

    Abstract translation: 通过用于原始和复制描述符的独特格式,便于从计算机存储器到外围存储器的信息叠加及其返回到计算机存储器。 复制描述符具有指定基地址或其原始位置的第一字段,以及指定索引的第二字段。 原始描述符具有指定基址的字段。 复制描述符将从其原件自动生成。 当检索到复制描述符时,如果第一个字段是基地址,则添加第一个和第二个字段以形成绝对地址。 如果第一个字段是原始描述符位置,则添加原始描述符的基址和复制描述符的索引以形成绝对地址。 在重叠时,通过将其基本值与要重叠的阵列的基值进行比较来检测要更新的复制描述符。 通过将原始描述符位置替换为基地址来更新它们,并且通过将外围存储器地址替换为基地址来更新原始描述符。 将重叠的信息返回到计算机存储器后,只能更新原始描述符。

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