摘要:
The invention pertains to a method and hardware for adding graphics capability to an existing alphanumeric computer system by providing graphics generation logic to existing alphanumeric generation logic and mixing and synchronizing the graphics data to the normal text display data.
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 multiple processor computer system features a store-into cache arrangement wherein each processor unit of the system has its own unique cache memory unit. Data operated upon by any one of the processor units is stored in the cache memory associated with that processor unit. When a thus modified block of data is required by another one of the processor units, the requested data is transferred directly to the requesting processor unit without having to first transfer the data to a shared main memory. Provision is also made for transferring data, under prescribed conditions from a cache to the main memory, but not as a precondition for transfer to a requesting processor.
摘要:
A memory system comprises a plurality of controllers each of which controls two pairs of daughter boards, each daughter board containing a quarter of the total memory of the controller. Each controller has a set of manually settable switches defining its identity (top end of memory address). Each controller includes reconfiguration apparatus which can be set, by reconfiguration commands, to store a new identity number and use that instead of the manually set number. Further reconfiguration command bits can control the effective arrangement of the daughter boards, dependent on whether the controller is half or fully populated, to put faulty ones off-line. Thus on a memory fault, the complete memory space may be maintained by reconfiguring the controllers within the memory space required.
摘要:
A memory system includes at least a pair of independently addressable dynamic memory module units, each of which includes a number of rows of random access memory (RAM) chips. The subsystem further includes an adder circuit, a pair of tristate operated address register circuits and timing circuits. The address circuits include a pair of tristate operated address registers coupled to the set of address lines of each memory unit. In response to a memory request, these registers store row and column address portions of a chip address, which are fed in succession to the chips. A multibit adder circuit increments by 1 the low order column address portion when the least significant address bit of the memory request indicates a subboundary address condition, thereby enabling access to a pair of sequential word locations. Whenever a memory request specifies an address which cannot access a double word, boundary circuits detect the condition and cause the timing circuits to generate only the timing signals necessary for accessing the first word location.
摘要:
A data processing system includes a commercial instruction processor for executing decimal alphanumeric instructions uses read only memories in the alignment of the operands. The characteristics of the operands, string or packed decimal as well as the length and position of the most significant decimal digit in a main memory word are specified by data descriptors. The read only memories are responsive to the data descriptor information as well as the instruction being executed to generate signals which specify whether the direction words are read from main memory is high order word first or low order word first, the number of double words in the operand, and the location of the least or most significant decimal digit within the word as stored in registers of the commercial instruction processor. A register coupled to an arithmetic logic unit stores double words of the operands wich are written into the register as double words, bytes or decimal digits. A multiplexer is responsive to control store signals and descriptor signals for generating write control signals which are applied to a read only memory, whose output write signals select the decimal digit, byte or double word positions of the register for writing. Another read only memory generates signals indicating next decimal digit position to be processed.
摘要:
What is disclosed is a time partitioned bus arrangement for use in a computer system wherein different circuits therein are interconnected by a plurality of busses and operation is such that information to be processed can be read out of one circuit, processed in some manner in another circuit, and the processed information be stored in the same or another circuit all within one cycle of a system clock in the computer system, and without the need for bus control circuits and bus interfaces in the circuitry connected to the busses. Some of the circuits have their input/output connected to only a single one of the busses, while other circuits have their input connected to one bus and their output connected to a different bus, and yet other circuits have either their input or output connected to one of the busses and their other input/output connected to circuitry external to the bus arrangement. Some of the processor circuits have a control lead input that is energized by the clock signal output from the system clock so that they accept information from one bus to which their input is connected during a first polarity portion of a clock cycle and return either unprocessed or processed information to another bus during a second polarity portion of a clock cycle.
摘要:
The electronic equipment of a computer system including electronic cards, power supplies, peripheral units, cooling units and internal and external cables are compactly packaged within a small enclosure in a way which permits sufficient airflow from front to rear of the enclosure. The enclosure includes a pair of rail members located at the rear which have a plurality of mounting positions for attaching a corresponding number of modular shelf members which are angled to permit the flow of air through established airflow paths. The rail and shelf members collectively form a bulkhead structure. The rail members are offset from the sides of the frame so as to form vertical channels on each side. The channels are used for retaining external cables which plug into connectors mounted on the shelf members and are distributed so as not to interfere with airflow.