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。
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 computer system includes a first processor with main memory, an input/output processor with associated memory and an archival memory. Prior to reloading a new operating system from archival memory into the main memory, information such as timer information is stored in the input/output memory. The input/output memory continues to update the timer information until the second operating system is bootstrap loaded into the main memory. The timer and other information may then be returned to the first processor and main memory for use by the second operating system.
摘要:
A Loadable Character Generator whose operation can be changed to suit various needs, such as foreign language requirements, without hardware change and with minimum hardware. The character generator translates the character code of a character to be displayed to the dot pattern for that particular character, utilizing a minimum of hardware. The loadable character generator of the invention replaces the ROM/PROM by a RAM utilizing 2K and 8 RAM memories, a 4K by 8 memory, 4 MUX chips, and a Motorola 6845 CRT Controller with various registers and is loaded through the attribute buffer.
摘要:
An apparatus for decoding data wherein only binary ZEROs are received as electronic pulses, each pulse alternating in opposite directions and wherein binary ONEs require no pulse.The apparatus includes logic for receiving the negative and positive binary ZERO pulses, retiming the pulses and generating a positive pulse for each binary ZERO pulse. The positive pulse is retimed to a pair of complementary pulses and applied to a receiving device, typically a universal synchronous/asynchronous receiver transmitter (USART).
摘要:
A display subsystem having a graphics capability includes a bit map memory for storing bits, each bit representing a displayed pixel. A read only memory stores words, each word representative of a pixel of a selected pattern which is used to fill out an area of the display thereby clearly identifying adjacent areas of the display to the operator. The selected patterns are displayed in a REPLACE, an OR or an EXCLUSIVE OR mode of operation.
摘要:
A color display graphics system includes three bit map memories for storing bits representing red, green and blue colors respectively. Combinations of bits from the same address locations of each bit map memory display a pixel which could be any one of eight colors: black, blue, green, cyan, red, magenta, yellow or white. A read only memory (ROM) stores patterns made up of sixteen bits in a four-by-four matrix for each of the red, green and blue colors. The 16-bit matrices are stored in their respective bit map memories for subsequent color display. Combinations of matrices may be used to show shades of the above eight colors and the mixing of any of those shades.
摘要:
An apparatus for encoding data for serial transmission wherein only logic ZEROs are transmitted as electronic pulses, each pulse alternating in opposite direction and wherein logic ONEs require no pulse.
摘要:
In a data processing system having a plurality of units coupled for the transfer of information therebetween over a common electrical bus or for transferring information via a communication channel to other data processing systems during asynchronously generated information bus transfer cycles, an apparatus exists for reformatting data for transfer over the common electrical bus or via the communication channel. The apparatus is comprised of an eight-way multiplexer responsive to control bits for selecting one of eight different formats during write or read operations to or from a memory. Additionally, during read operations, the apparatus transfers a return address from a unit requesting information to the address bus so that data read from memory may be transferred to the requesting device. The formatting control bit is similarly reformatted from the data bus to the address bus bit.
摘要:
A method and apparatus for assuring the accuracy of data received by any device in a computer system from any other device in the same computer system or from another computer system. The existing hardware of a computer system is utilized to generate a cyclic redundant check character each time a unit of data is transmitted. The cyclic redundant check character is concatenated to the right of such data transmitted. Each time that the particular data is received, the check character and the data with which it is associated, is again manipulated in the same manner as in generating the check character. If the data received is the same as the data transmitted, the result of such manipulation is zero.