摘要:
A host data processing system which includes a plurality of input/output devices operates under the control of an enhanced version of the UNIX operating system. The host system includes an emulator which runs as an application process for executing user emulated system (ES) application programs. The emulator includes a number of emulated system executive service components operating in shared memory and an interpreter, an emulator monitor call unit (EMCU) and a number of server facilities operating in the host memory. The ES executive service command handler component is extended to accommodate a number of dual decor commands which invoke host system facilities to execute terminal based commands either synchronously or asynchronously through the automatic creation of host shell mechanisms directly accessible by emulated system users. The server facilities include a network terminal driver (NTD) server for executing emulated system user terminal requests through host system drivers. Additionally, the NTD server includes mechanisms enabling a user to have direct terminal access to host facilities for executing procedures through such shell mechanisms. The mechanisms perform trusted user level validation when each dual decor command is issued and the shell mechanisms use the host access control mechanisms for checking access when the procedure is executed preventing both unauthorized user access and compromises in user data through the improper use of dual decor commands.
摘要:
In a data processing system having a plurality of remote terminals, possibly of several kinds, connected by a plurality of communications media, also possibly of several kinds, from which terminals users may run a plurality of application programs in the central processing unit (CPU) of the data processing system, the CPU is provided with a network terminal driver for regulating transmissions between the various application programs and the various types of terminals over the various types of communications media. Means are provided for specifying the characteristics of the various types of application programs, terminals, and communications media, and the network terminal drive is responsive to those means.
摘要:
A computer system is described wherein two independent processors communicate via a bus system and operate substantially concurrently, each computer having its own operating system software and share a common memory. The architecture of the computer system is such that one of the processors is allocated the bulk of memory band-width with the other processor taking the remainder. Arbitration for memory allocation is accomplished via a combination of a new firmware instruction and a semaphore.
摘要:
A microprogrammed data processing system includes a central processing unit (CPU), a main memory and a number of mass storage controllers. A block of information is transferred between main memory and one of the mass storage controllers during data multiplex control (DMC) cycles. The main memory stores 2 data bytes in each word location. An input/output RAM stores channel number signals for identifying mass storage controllers. An I/O microprocessor addresses the I/O RAM to read the channel number signals onto the system bus, and a mass storage controller coupled to the system bus responds to the channel number signals to generate a read/write signal. The system responds to a request signal, the read/write signal and a signal indicative of a left or right bit of an addressed location in main memory to generate a plurality of data request signals. A read only memory is addressed in response to the data request signals to read out a plurality of microprograms for processing the data.
摘要翻译:微程序数据处理系统包括中央处理单元(CPU),主存储器和多个大容量存储控制器。 在数据多路复用控制(DMC)周期期间,一块信息在主存储器和大容量存储控制器之一之间传送。 主存储器在每个字位置存储2个数据字节。 输入/输出RAM存储用于识别大容量存储控制器的通道号信号。 I / O微处理器将I / O RAM寻址到系统总线上的通道号信号,耦合到系统总线的大容量存储控制器响应信道号信号以产生读/写信号。 系统响应请求信号,读/写信号和指示主存储器中寻址位置的左或右位的信号,以产生多个数据请求信号。 响应于数据请求信号寻址只读存储器以读出用于处理数据的多个微程序。
摘要:
A host data processing system which includes a plurality of input/output devices operates under the control of an enhanced version of the UNIX operating system. The host system includes an emulator which runs as an application process for executing user emulated system (ES) application programs. The emulator includes a number of emulated system executive service components operating in shared memory and an interpreter, an emulator monitor call unit (EMCU) and a network terminal driver (NTD) component operating in the host memory. Configuration command means are provided for initially configuring a host terminal to operate in a plurality of asynchronous driver (ATD) modes implemented by the NTD component. When a terminal has been configured by a user to run applications written for the ATD driver, it sets a mode indication which causes the NTD component to respond to user applications as an ATD driver and determine if each ATD request can be carried out with functionality included within the NTD component. If the request can be carrier out, the NTD component translates ATD device specific information contained in each request into NTD device specific information which invokes the required functionality at the appropriate time so that the request can be processed by the NTD component. At the completion of each such request, the NTD component utilizing information contained in the original request updates the return status information to that of the ATD driver. This arrangement provides ATD applications access to NTD controlled host terminals without having to port ATD software or have users modify their existing applications.
摘要:
A controller for controlling a large number of terminals and workstations semantically interprets entering character sequences with little load on its computing power by means of dispatching under the control of a hierarchical arrangement of lookup tables, wherein one possible action that may be dispatched to is the selection of another table in the hierarchy. Characters may thus be interpreted in the context of the characters that have preceded them. Another possible action is to switch to a memory search mode of interpretation, eliminating the need to provide lookup tables for infrequently occurring sequences.
摘要:
A data processing system includes a central processing unit (CPU), an input/output microprocessor, a main memory and a number of mass storage controllers. A block of information is transferred between one of the mass storage controllers and main memory during data multiplex control (DMC) cycles. The CPU includes registers which store the address of main memory into which the next data byte is written or read from and the range indicating the number of data bytes remaining to be transferred. Prior to a DMC cycle the CPU stores address and range information in a mailbox location in an I/O RAM and the I/O microprocessor transfers that information to channel table locations in the I/O RAM. For a DMC operation, the I/O microprocessor transfers the address and range information to the mailbox location and transfers the mass storage information to the mass storage controller. It signals a CPU interrupt and issues a read or write order to the mass storage controller. The CPU then retrieves the address and range information from the mailbox location and initiates a DMC cycle.
摘要翻译:数据处理系统包括中央处理单元(CPU),输入/输出微处理器,主存储器和多个大容量存储控制器。 在数据多路复用控制(DMC)周期期间,一块信息在大容量存储控制器和主存储器之间传送。 CPU包括存储下一个数据字节被写入或读取的主存储器的地址的寄存器以及指示待传送的数据字节数的范围。 在DMC循环之前,CPU将地址和范围信息存储在I / O RAM中的邮箱位置,I / O微处理器将该信息传输到I / O RAM中的通道表位置。 对于DMC操作,I / O微处理器将地址和范围信息传送到邮箱位置,并将大容量存储信息传输到大容量存储控制器。 它发出CPU中断信号,向大容量存储控制器发出读或写命令。 CPU然后从邮箱位置检索地址和范围信息,并启动DMC循环。