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公开(公告)号：US5210847A
公开(公告)日：1993-05-11
申请号：US354513
申请日：1989-05-19
CPC分类号： G06F12/0888
摘要： A computer system uses a random access memory to store memory characteristic information, such as noncacheable status. The memory is coupled to the processor address lines to produce an output representative of the memory address block, the output used as appropriate, for example by the noncacheable address input of a cache controller. Latches are used to store programming mode, write or read operation and data values. The reading and writing of the random access memory is performed without disturbing the main memory.
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公开(公告)号：US5097506A
公开(公告)日：1992-03-17
申请号：US525490
申请日：1990-05-18
IPC分类号： G06F21/00
摘要： A keyboard controller or interface with scans entered key sequences for a key sequence activating a keyboard lock feature. A password and particular hot key are loaded by the system microprocessor. The keyboard interface then scans untl the designated sequence is activated. All keyboard activity is blocked from the system microprocessor until a password sequence is entered. Codes releasing some of the key strokes in the activation sequence are transmitted and normal operation, including activation sequence scanning, resumes. The password mode may be directly activated on command from the system microprocessor.
摘要翻译： 键盘控制器或带有扫描的界面输入键盘序列，以激活键盘锁定功能。 密码和特定热键由系统微处理器加载。 键盘界面然后扫描未指定的序列被激活。 所有键盘活动都将从系统微处理器中被阻止，直到输入密码序列。 发送释放激活序列中的一些关键笔划的代码，恢复正常操作，包括激活序列扫描。 可以从系统微处理器的命令直接激活密码模式。
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公开(公告)号：US4942606A
公开(公告)日：1990-07-17
申请号：US307404
申请日：1989-02-07
IPC分类号： G06F21/00
CPC分类号： G06F21/85
摘要： A computer having an improved keyboard/auxiliary device interface controller which supports the selective restriction of user interaction with the computer system, while maintaining the full internal functionality of the host/peripheral interface. A "password lock mode" of the improved controller prevents users from gaining unauthorized access to the computer system, but still application and operating system software can continue to issue commands to and receive responses from the otherwise disabled peripheral devices. The improved controller does not require modification to the conventional keyboard/auxiliary device hardware.
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4.发明授权
公开(公告)号：US5001472A
公开(公告)日：1991-03-19
申请号：US154970
申请日：1988-02-11
IPC分类号： H04L12/417
CPC分类号： H04L12/417
摘要： In a token-based local area network, the token may be selectively redirected out of its normal even rotational sequence among all of the active nodes of the network to pass the token more frequently through a priority group of nodes than through a non-priority group of nodes. The priority group is more likely to have messages to initiate from either a numerical or immediacy standpoint, compared to the non-priority group which is less likely to have messages to initiate. When token redirection is not desired, the token is passed in this normal even rotational sequence. Despite redirection, the token is still passed through all of the active nodes on the network in a periodic manner so as to assure normal network activity. Multiple messages can be initiated from a single node before the token is passed to any other node. Token redirection can be controlled in a predetermined pattern to accommodate either the actual or anticipated message traffic from the priority group of nodes, and can be controlled in response to a queue of messsages waiting to be initiated from a priority node.
摘要翻译： 在基于令牌的局域网中，令牌可以被选择性地从网络的所有活动节点中的正常均匀旋转序列重定向，以通过优先级节点组比通过非优先级组更频繁地传递令牌 的节点。 与非优先级组相比，优先级组更有可能从数字或即时性的角度发起消息，这些组不太可能发起消息。 当不需要令牌重定向时，令牌以这个正常的均匀旋转顺序传递。 尽管重定向，令牌仍然以周期的方式通过网络上的所有活动节点，以确保正常的网络活动。 在将令牌传递到任何其他节点之前，可以从单个节点启动多个消息。 可以以预定模式控制令牌重定向以适应来自优先级节点组的实际或预期消息业务，并且可以响应于等待从优先级节点发起的消息队列来进行控制。
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公开(公告)号：US5392441A
公开(公告)日：1995-02-21
申请号：US143529
申请日：1993-10-26
CPC分类号： G06F13/4072 , G06F13/4217
摘要： A data field having a variable number of zero-level bits is read by a bus in a digital system, wherein the bus is pumped by writing all logical "one" bits onto the bus lines just before they are read. The unused bits will then be still in a logical "one" state, i.e. a known value, rather than floating or at an indeterminate value. A program for performing this operation in a computer uses steps to prevent other operations such as refresh cycles or interrupts from being interposed between the write and read cycles. A CPU may use this method to read a system identifier value upon boot-up, for example.
摘要翻译： 具有可变数量的零电平位的数据字段由数字系统中的总线读取，其中通过在读取总线之前将所有逻辑“1”位写入总线来泵送总线。 然后，未使用的位将仍然处于逻辑“一”状态，即已知值，而不是浮动或不确定值。 用于在计算机中执行该操作的程序使用步骤来防止诸如刷新周期或中断之类的其他操作被插入在写周期和读周期之间。 例如，CPU可以使用该方法在启动时读取系统标识符值。
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公开(公告)号：US5325529A
公开(公告)日：1994-06-28
申请号：US526036
申请日：1990-05-18
IPC分类号： G06F9/445
CPC分类号： G06F9/4416
摘要： A computer system which can receive boot information over a parallel or serial port. The ports are inspected for activity prior to attempting to boot from a floppy or hard disk. If there is activity on the port the sequence being received is read and compared to a predetermined identification sequence. If a match is made, an acknowledgement character is transmitted. A communication sequence commences to transfer the boot information over the link. After the transfer is complete, the boot information is executed. The serial transfer utilizes the conventional serial lines, while the parallel transfer is performed a nibble at a time. This nibble mode allows use of only outputs to inputs to avoid dual source driving problems.
摘要翻译： 可以通过并行或串行端口接收引导信息的计算机系统。 在尝试从软盘或硬盘启动之前，检查端口是否有活动。 如果端口上有活动，则读取接收的序列并与预定的识别序列进行比较。 如果进行匹配，则发送确认字符。 通信序列开始通过链路传输引导信息。 传输完成后，执行引导信息。 串行传输利用传统的串行线，而并行传输一次执行一个半字节。 该半字节模式允许仅使用输出来输入以避免双源驱动问题。
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公开(公告)号：US4959860A
公开(公告)日：1990-09-25
申请号：US307402
申请日：1989-02-07
IPC分类号： G06F21/00
CPC分类号： G06F21/79
摘要： A power-on password security function for a digital computer system allows the system software to distinguish between authorized and unauthorized users. Safeguards are made against corruption of password data which could lead to lock-out authorized users, and redundant checks allow the security function to operate even when first-level checks fail. The battery-powered RAM storage area used to hold the password when the system is turned "off" is protected against being accessible by unauthorized users when the system is turned "on".
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