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21. 发明授权

US4859952A Apparatus and method for testing impedances of interconnect devices 失效
标题翻译：用于测试互连器件阻抗的装置和方法
公开(公告)号：US4859952A
公开(公告)日：1989-08-22
申请号：US137928
申请日：1987-12-28
申请人： Daniel Wissell
发明人： Daniel Wissell
IPC分类号： G01R31/04
CPC分类号： G01R31/04
摘要： In electronic devices, such as data processing systems that operate at high frequencies, the integrity of the interconnect or coupling apparatus transferring signals between component modules is critical to prevent compromise of information being transferred. However, the interconnect or coupling apparatus is subject to both long term and to short term impedance variations. Apparatus is disclosed for testing both the long term impedance changes and the rapid fluctuations that are not observable by current testing procedures. In addition, apparatus is disclosed for providing controllable rapid impedance changes to verify the operation of test apparatus, disclosed herein, for measuring the rapid impedance changes.
摘要翻译：在诸如在高频率下操作的数据处理系统的电子设备中，在组件模块之间传送信号的互连或耦合设备的完整性对于防止正在传送的信息的损害是至关重要的。然而，互连或耦合设备受到长期阻抗和短期阻抗变化的影响。公开了用于测试长期阻抗变化和当前测试程序不能观察到的快速波动的装置。此外，公开了用于提供可控的快速阻抗变化以验证本文公开的用于测量快速阻抗变化的测试装置的操作的装置。

22. 发明授权

US3900835A Branching circuit for microprogram controlled central processor unit 失效
标题翻译：用于微控制中央处理器单元的分支电路
公开(公告)号：US3900835A
公开(公告)日：1975-08-19
申请号：US40034273
申请日：1973-09-24
申请人： DIGITAL EQUIPMENT CORP
发明人： BELL C GORDON , BUZYNSKI JOHN E , KAMAN CHARLES H , O'LOUGHLIN JAMES F
IPC分类号： G06F9/26 , G06F9/16
CPC分类号： G06F9/261 , G06F9/264
摘要： A central processor unit under the control of microprogram words retrieved from a storage facility in sequence. A control section in each microprogram word contains information used to define data paths while an address portion identifies the location of the next microprogram word in sequence. A buffer register receives each microprogram word, the address passing through a modification circuit. If a first microprogram word sets up branching conditions within the central processor unit, other circuitry establishes an address offset which is applied to a base address contained in the next microprogram word to thereby alter the location of the following microprogram word. Thus, any microprogram word which can produce a branch must be followed with an other microprogram word which does not depend upon the branch conditions, but which contains a base address.

23. 发明授权

US3886052A Method of making a magnetic recording disc 失效
标题翻译：制作磁记录盘的方法
公开(公告)号：US3886052A
公开(公告)日：1975-05-27
申请号：US33164673
申请日：1973-02-12
申请人： DIGITAL EQUIPMENT CORP
发明人： SMITH ROBERT SAMUEL
IPC分类号： G11B5/84 , C23B5/62
CPC分类号： G11B5/84 , Y10S205/917 , Y10S428/928 , Y10T428/12611
摘要： A magnetic recording disc and method of making the same is disclosed wherein a prepared aluminum substrate is first anodized and then plated with a nonmagnetic copper alloy to provide an electroplatable surface. The disc is then electroplated with a ferromagnetic material and heat treated to form a thin oxide over the outer surface which provides a hard, wear resistant coating for the disc.
摘要翻译：公开了一种磁记录盘及其制造方法，其中首先对制备的铝基板进行阳极氧化，然后用非磁性铜合金镀以提供电镀表面。然后将该盘用铁磁材料电镀并进行热处理以在外表面上形成薄的氧化物，为该盘提供硬的耐磨涂层。

24. 发明授权

US3877007A Apparatus for displaying lower case letters 失效
标题翻译：显示下方字母的装置
公开(公告)号：US3877007A
公开(公告)日：1975-04-08
申请号：US40016873
申请日：1973-09-24
申请人： DIGITAL EQUIPMENT CORP
发明人： FISHMAN AARON J
IPC分类号： G09G1/18 , G08B5/36
CPC分类号： G09G1/18
摘要： Circuitry in a matrix display for shifting certain lower case letters downwardly. While a character generator receives information in one column of a matrix for a lower case character, the display of the character is blanked. One bit position in that column indicates whether the character is to be displaced downwardly on the line. Circuitry in the display monitors this bit position and alters the deflection signal to the Y deflection axis to produce the appropriate shift.

25. 发明授权

US3832489A Bidirectional bus repeater 失效
标题翻译：双向总线代理
公开(公告)号：US3832489A
公开(公告)日：1974-08-27
申请号：US33495173
申请日：1973-02-26
申请人： DIGITAL EQUIPMENT CORP
发明人： KRISHNA R
IPC分类号： G06F13/40 , H04L5/14 , H04L25/24 , H04L25/20
CPC分类号： G06F13/4045 , H04L5/1423 , H04L25/24
摘要： A bus repeater circuit for interconnecting first and second corresponding transmission lines for first and second adjacent bidirectional electrical bus sections. The bus repeater circuit includes first and second current sensors associated with each transmission line to apply a bipolar signal to first and second amplifiers respectively. Output signals from a given sensor of a first polarity indicate that the associated transmission line is transmitting a signal. The associated amplifier couples that signal to the other bus wire. Signals of a second polarity indicate that the associated bus transmission line is not transmitting a signal to the repeater and the associated amplifier provides a corresponding signal, thereby avoiding a latched condition.
摘要翻译：一种用于互连用于第一和第二相邻双向电母线段的第一和第二对应传输线的总线中继器电路。总线中继器电路包括与每个传输线相关联的第一和第二电流传感器，以分别向第一和第二放大器施加双极性信号。来自第一极性的给定传感器的输出信号表示相关传输线正在发送信号。相关放大器将该信号耦合到另一总线。第二极性的信号表示相关联的总线传输线不向中继器发送信号，并且相关联的放大器提供相应的信号，从而避免锁存状态。

26. 发明授权

US3743839A Control circuit for a tape reader 失效
标题翻译：磁带阅读器的控制电路
公开(公告)号：US3743839A
公开(公告)日：1973-07-03
申请号：US3743839D
申请日：1971-12-03
申请人： DIGITAL EQUIPMENT CORP
发明人： LEIS M , GRAY R
IPC分类号： G06K7/016 , G06K13/18 , H01J39/12
CPC分类号： G06K7/016 , G06K13/18
摘要： A tape reader. Periodic pulses energize a driving motor to advance a punched tape past a reading device; they also enable a reading operation. Each motor pulse sets a flip-flop circuit. When a detector senses registration of a sprocket hole in the tape with the reader, it generates an output which, if in time coincidence with the flip-flop output, produces a strobing pulse that causes the reading device to sense data on the tape. The strobing pulse immediately resets the flip-flop circuit to inhibit further strobing pulses until the next motor pulse occurs.
摘要翻译：磁带阅读器周期性脉冲使驱动电机通电，使穿孔带通过读取装置; 他们还可以进行阅读操作。每个电机脉冲设置一个触发器电路。当检测器用读取器感测到带中的链轮孔的配准时，其产生一个输出，如果与触发器输出的时间一致，则产生使读取装置感测磁带上的数据的选通脉冲。选通脉冲立即复位触发器电路以禁止进一步选通脉冲，直到发生下一个电机脉冲。

27. 发明授权

US3614740A Data processing system with circuits for transferring between operating routines, interruption routines and subroutines 失效
标题翻译：具有用于传送操作程序，中断程序和子程序的电路的数据处理系统
公开(公告)号：US3614740A
公开(公告)日：1971-10-19
申请号：US3614740D
申请日：1970-03-23
申请人： DIGITAL EQUIPMENT CORP
发明人： DELAGI BRUCE A , MCFARLAND HAROLD L JR , O'LOUGHLIN JAMES F
IPC分类号： G06F9/42 , G06F9/46 , G06F9/12
CPC分类号： G06F9/4426 , G06F9/461
摘要： A data processing system processor unit for executing instructions from one of a plurality of partially completed operating routines. With each subroutine transfer a first register provides memory location address for storing a second register contents. The program count is stored in the second register; and the first subroutine instruction address is transferred to the program counter. A last subroutine instruction moves the second register contents to the program counter and the memory location contents to the second register. When an interruption routine is started, the contents of the program counter and a status register are transferred directly into a pair of memory locations defined by addresses from the first register. A last interruption routine instruction moves the contents of the two memory locations defined by addresses from the first register to the processor unit. The last operating routine to be started is always the first one to be completed so that any number of routines may be partially completed.

28. 发明授权

US3484708A Current driver with overload protection 失效
标题翻译：具有过载保护功能的当前驱动器
公开(公告)号：US3484708A
公开(公告)日：1969-12-16
申请号：US3484708D
申请日：1967-03-21
申请人： DIGITAL EQUIPMENT CORP
发明人： ILLINGWORTH LEWIS
IPC分类号： H03G11/00 , H03K5/02 , H03F21/00
CPC分类号： H03K5/02 , H03G11/00

29. 发明授权

US3401375A Apparatus for performing character operations 失效
标题翻译：用于执行字符操作的装置
公开(公告)号：US3401375A
公开(公告)日：1968-09-10
申请号：US49195465
申请日：1965-10-01
申请人： DIGITAL EQUIPMENT CORP
发明人： BELL CHESTER G , ALAN KOTOK
IPC分类号： G06F9/308 , G06F9/355 , G06F12/04
CPC分类号： G06F9/30018 , G06F9/355 , G06F12/04

30. 发明授权

US3298014A Analog to digital converter 失效
公开(公告)号：US3298014A
公开(公告)日：1967-01-10
申请号：US32071063
申请日：1963-11-01
申请人： DIGITAL EQUIPMENT CORP
发明人： STEPHENSON BARBERA W
IPC分类号： H03M1/00
CPC分类号： H03M1/00 , H03M1/50

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