Apparatus to execute DMA transfer between computing devices using a
block move instruction
    2.
    发明授权
    Apparatus to execute DMA transfer between computing devices using a block move instruction 失效
    使用块移动指令在计算设备之间执行DMA传输的装置

    公开(公告)号:US4344130A

    公开(公告)日:1982-08-10

    申请号:US79209

    申请日:1979-09-26

    CPC分类号: G06F15/167

    摘要: There is shown and described a method and apparatus for using a "block move" instruction in a microprocessor to execute the direct memory access (DMA) data transfer function between a microprocessor and a minicomputer. The instruction permits an apparent data transfer in the memory of the microprocessor to be utilized to transfer data to the memory in the minicomputer. Little or no additional hardware over existing systems is required.

    摘要翻译: 示出并描述了在微处理器中使用“块移动”指令来执行微处理器和小型计算机之间的直接存储器访问(DMA)数据传送功能的方法和装置。 该指令允许微处理器的存储器中的明显数据传输用于将数据传送到小型计算机中的存储器。 需要很少的或没有额外的硬件在现有的系统上。

    Streaming tape drive with direct block addressability
    3.
    发明授权
    Streaming tape drive with direct block addressability 失效
    流式磁带驱动器具有直接的块寻址能力

    公开(公告)号:US4858039A

    公开(公告)日:1989-08-15

    申请号:US152384

    申请日:1988-02-04

    IPC分类号: G11B5/09 G11B5/55 G11B27/10

    CPC分类号: G11B27/107 G11B5/5508

    摘要: A streaming tape drive for use in computer systems for the storage and retrieval of data on magnetic tape has the capability of locating a selected block of data stored on magnetic tape in serpentine fashion by first moving the magnetic head of the tape drive from one data track to another data track until the head is positioned to a data track which has a data block having a block number that is within a predetermined numeric value of the block number of the selected data block for which tape drive is searching. After the head is so moved to the data track, the tape drive performs a sequential search of the tape on a block-by-block basis until the selected data block is found. The tape drive has the capability to perform such searches on magnetic tape that is recorded in standard serpentine fashion, and no special tape recording format is required.

    摘要翻译: 用于计算机系统中用于存储和检索磁带上的数据的流式磁带驱动器具有以蛇形方式存储在磁带上的选定数据块的能力,首先将磁带驱动器的磁头从一个数据磁道 到另一数据轨道,直到磁头定位到数据磁道,数据磁道具有数据块,该数据块具有在磁带驱动器正在搜索的所选数据块的块号的预定数值内的块号。 在头部被移动到数据轨道之后,磁带驱动器在逐块的基础上执行磁带的顺序搜索,直到找到所选择的数据块。 磁带机能够以标准蛇形方式记录在磁带上执行这种搜索,并且不需要特殊的磁带记录格式。