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    • 1. 发明授权
    • Interrupt level sharing
    • 中断级共享
    • US4631670A
    • 1986-12-23
    • US629868
    • 1984-07-11
    • David J. BradleyWilliam B. Ott
    • David J. BradleyWilliam B. Ott
    • G05B19/05G06F9/48G06F13/24G06F9/46
    • G06F13/24
    • An interrupt interface circuit for interrupt level sharing comprising a pulse generator having an open-collector or tri-state output connected to an external interrupt line shared by other similar circuits. An active internal interrupt signal causes the pulse generator to pulse. The external interrupt line is fed back and latched on a disabling input of the pulse generator so that any pulse on the external interrupt line prevents further pulsing. The software handler of the interrupt, upon servicing an interrupt of the interrupt level, causes the enabling of the pulse generators of that level, thereby permitting active internal interrupt signals to produce a further pulse. By this interrupt level sharing, phantom interrupts are eliminated and servicing overhead is minimized. R
    • 一种用于中断级共享的中断接口电路,包括具有开路集电极或三态输出的脉冲发生器,其连接到由其它类似电路共享的外部中断线。 激活的内部中断信号使脉冲发生器脉冲。 外部中断线反馈并锁存在脉冲发生器的禁用输入端,使外部中断线上的任何脉冲防止进一步脉冲。 中断的软件处理程序在服务于中断级别的中断时,使能该电平的脉冲发生器,从而允许有效的内部中断信号产生另外的脉冲。 通过这种中断级别共享,可以消除幻像中断,从而最大限度地减少服务开销。
    • 2. 发明授权
    • Page addressing mechanism
    • 页面寻址机制
    • US4443847A
    • 1984-04-17
    • US231653
    • 1981-02-05
    • David J. BradleyLewis C. EggebrechtDennis S. GibbsDonald J. Kostuch
    • David J. BradleyLewis C. EggebrechtDennis S. GibbsDonald J. Kostuch
    • G06F12/06G06F9/34G06F12/10G06F9/30
    • G06F12/10
    • In a computer system, paging operates and a method of use thereof are provided for extending the addressing capability of a processor by using a page register. The page register includes means for storing different codes for different operations to be performed on the memory. The memory is divided into four groups of memory within 2.sup.n addresses such that there is paged and unpaged ROM and pages and unpaged RAM. The unpaged ROM and RAM include only a single block which is directly addressed by the n bit address bus. The paged ROM and RAM includes a plurality of blocks or pages, one of which is selected to be addressed by the page register. The page register responds to the address bus and to signals from the processor defining the memory operation to be performed by providing page signals, selecting one page of paged memory. The method of using the paging apparatus includes creating a table in the unpaged RAM of all routines in the paged memory blocks and using the table to transfer from one routine to another. Within the table is a code identifying the page in which the new routine exists and an offset into that page used to determine the address in that page of the new routine.
    • 在计算机系统中,寻呼操作及其使用方法被提供用于通过使用页寄存器来扩展处理器的寻址能力。 页面寄存器包括用于存储不同代码以用于在存储器上执行的不同操作的装置。 存储器在2n个地址中分为四组存储器,使得存在分页和未分页的ROM和页面和未分页的RAM。 未分页的ROM和RAM仅包括由n位地址总线直接寻址的单个块。 分页ROM和RAM包括多个块或页面,其中一个块或页面被选择为由页面寄存器寻址。 页寄存器响应地址总线和来自处理器的信号,定义要通过提供寻呼信号来执行的存储器操作,选择一页寻呼存储器。 使用寻呼装置的方法包括在分页存储块中的所有例程的未分页RAM中创建表,并使用该表从一个例程转移到另一个例程。 表内是一个代码,用于标识新例程所在的页面以及用于确定该新例程的该页面中的地址的该页面的偏移量。
    • 4. 发明授权
    • Apparatus and method for reading and writing text characters in a
graphics display
    • 用于在图形显示中读取和写入文本字符的装置和方法
    • US4408200A
    • 1983-10-04
    • US292084
    • 1981-08-12
    • David J. Bradley
    • David J. Bradley
    • G09G5/24G09G1/28G09G5/02G09G5/393G09G5/40G09G1/02
    • G09G5/02G09G5/393
    • Apparatus and method for writing text characters to a raster scan video display operated in an all-points-addressable, or graphics, mode, and for reading characters thus written. A graphic video display buffer directly refreshes the display with graphics data received from a microprogrammed processor. The processor writes a character to the display by selecting and loading into the graphics video display buffer a text character dot pattern retrieved from main storage, and reads a character previously written by comparing a dot pattern retrieved from the display buffer with dot patterns retrieved from main storage. To write a character to the display in color, the graphic dot image of a selected character retrieved from main storage is expanded to a selected pixel and color format, and stored in the graphics video display buffer. Text characters thus written in color are read by retrieving from the display buffer the expanded dot image, restoring the expanded dot image to its original form, and comparing the restored dot image with graphic dot images retrieved from storage.
    • 将文字字符写入以全点可寻址或图形模式操作并用于读取由此写入的字符的光栅扫描视频显示器的装置和方法。 图形视频显示缓冲器直接用从微程序处理器接收的图形数据刷新显示。 处理器通过从主存储器中选择并加载到图形视频显示缓冲器中的文本字符点图案,将字符写入显示器,并且通过将从显示缓冲器检索的点图案与从主存储器检索的点图案进行比较来读取先前写入的字符 存储。 要将字符写入显示器的颜色,将从主存储器检索到的所选字符的图形点图像扩展为所选择的像素和颜色格式,并存储在图形视频显示缓冲器中。 通过从显示缓冲器中取出扩展的点图像,将扩展的点图像恢复到其原始形式,并将恢复的点图像与从存储器检索到的图形点图像进行比较,来读取由此写入的文本字符。
    • 6. 发明授权
    • Apparatus and method for scrolling text and graphic data in selected
portions of a graphic display
    • 用于在图形显示器的选定部分中滚动文本和图形数据的装置和方法
    • US4437093A
    • 1984-03-13
    • US292081
    • 1981-08-12
    • David J. Bradley
    • David J. Bradley
    • G06F3/048G06F3/14G06T11/00G09G5/14G09G5/34G09G1/16
    • G09G5/34G09G5/14
    • An apparatus and method for scrolling windows of both graphic and graphic encoded text information on a raster scan display. The apparatus includes a processor which references a program store, and a video refresh buffer, the buffer containing graphic and graphic encoded text data in a pixel format adapted for directly refreshing the display. The processor is operated under control of the program store and responsive to information specifying the pixel locations of opposite corners of a window to be scrolled and the number of rows to be scrolled for calculating the size and location in the display refresh buffer of the window to be scrolled, and for moving the number of rows to be scrolled from source locations to destination locations within the window in the display refresh buffer.
    • 一种用于在光栅扫描显示器上滚动图形和图形编码文本信息的窗口的装置和方法。 该装置包括参考程序存储器和视频刷新缓冲器的处理器,该缓冲器包含适于直接刷新显示器的像素格式的图形和图形编码文本数据。 处理器在程序存储器的控制下操作,并且响应于指定要滚动的窗口的相对角的像素位置的信息以及要滚动的行数用于计算窗口的显示刷新缓冲器中的大小和位置到 滚动,并将要从源位置滚动的行数移动到显示刷新缓冲区内窗口内的目标位置。
    • 9. 发明授权
    • System for managing a plurality of shared interrupt handlers in a
linked-list data structure
    • 用于在链表列表数据结构中管理多个共享中断处理程序的系统
    • US4768149A
    • 1988-08-30
    • US770541
    • 1985-08-29
    • Bradly J. KonopikDavid J. BradleyMartin A. ReedAlan R. TannenbaumMichael R. Turner
    • Bradly J. KonopikDavid J. BradleyMartin A. ReedAlan R. TannenbaumMichael R. Turner
    • G06F9/46G06F9/48G06F13/24
    • G06F9/4812G06F13/24
    • A system is disclosed for managing a plurality of interrupt handlers in a linked-list data structure, for servicing a plurality of input/output devices sharing a common interrupt line in a microcomputer. The system provides for an orderly method to link a newly loaded interrupt handler routine into a linked-list data structure consisting of previously loaded interrupt handler routines. The system further provides for an orderly method to share a common interrupt line among a plurality of input/output devices being serviced by the interrupt handlers. The system further provides for an orderly means to unlink a particular interrupt handler routine from the linked-list data structure when a corresponding input/output device is to be deactivated. The system finds special utility in a multitasking operating system environment where input/output devices can be deactivated in a different sequence from that in which they were originally activated.
    • 公开了一种用于管理链接列表数据结构中的多个中断处理程序的系统,用于维护在微计算机中共享公共中断线的多个输入/输出设备。 该系统提供了一种有序的方法来将新加载的中断处理程序例程链接到由先前加载的中断处理程序例程组成的链表数据结构中。 该系统进一步提供一种有序的方法来在由中断处理程序服务的多个输入/输出设备之间共享公共中断线。 当相应的输入/输出设备被去激活时,该系统进一步提供一种有序的方法来将特定的中断处理程序例程与链表列表数据结构断开连接。 该系统在多任务操作系统环境中找到特殊的实用程序,其中输入/输出设备可以与其最初激活的序列不同的顺序禁用。
    • 10. 发明授权
    • Method for using page addressing mechanism
    • 使用页面寻址机制的方法
    • US4374417A
    • 1983-02-15
    • US231639
    • 1981-02-05
    • David J. BradleyDennis D. GibbsDonald J. KostuchJames S. Martin
    • David J. BradleyDennis D. GibbsDonald J. KostuchJames S. Martin
    • G06F9/34G06F12/06G06F12/10G06F9/30
    • G06F12/10
    • In a computer system, paging operates and a method of use thereof are provided for extending the addressing capability of a processor by using a page register. The page register includes means for storing different codes for different operations to be performed on the memory. The memory is divided into four groups of memory within 2.sup.n addresses such that there is paged and unpaged ROM and paged and unpaged RAM. The unpaged ROM and RAM include only a single block which is directly addressed by the n bit address bus. The paged ROM and RAM includes a plurality of blocks or pages, one of which is selected to be addressed by the page register. The page register responds to the address bus and to signals from the processor defining the memory operation to be performed by providing page signals, selecting one page of paged memory. The method of using the paging apparatus includes creating a table in the unpaged RAM of all routines in the paged memory blocks and using the table to transfer from one routine to another. Within the table is a code identifying the page in which the new routine exists and an offset into that page used to determine the address in that page of the new routine.
    • 在计算机系统中,寻呼操作及其使用方法被提供用于通过使用页寄存器来扩展处理器的寻址能力。 页面寄存器包括用于存储不同代码以用于在存储器上执行的不同操作的装置。 存储器在2n个地址内分为四组存储器,使得存在分页和未分页的ROM和分页和未分页的RAM。 未分页的ROM和RAM仅包括由n位地址总线直接寻址的单个块。 分页ROM和RAM包括多个块或页面,其中一个块或页面被选择为由页面寄存器寻址。 页寄存器响应地址总线和来自处理器的信号,定义要通过提供寻呼信号来执行的存储器操作,选择一页寻呼存储器。 使用寻呼装置的方法包括在分页存储块中的所有例程的未分页RAM中创建表,并使用该表从一个例程转移到另一个例程。 表内是一个代码,用于标识新例程所在的页面以及用于确定该新例程的该页面中的地址的该页面的偏移量。