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CVAX
The CVAX is a microprocessor chipset developed and fabricated by Digital Equipment Corporation (DEC) that implemented the VAX instruction set architecture (ISA). The chipset consisted of the CVAX 78034 CPU, CFPA floating-point accelerator, CVAX clock chip, and the associated support chips, the CVAX System Support Chip (CSSC), CVAX Memory Controller (CMCTL), and CVAX Q-Bus Interface Chip (CQBIC). CVAX 78034 The CVAX 78034, also known as the MicroVAX 78034, is a second-generation single-chip VAX microprocessor. Systems featuring the CVAX chip set became available in late 1987. It is clocked at frequencies of 12.5 MHz (80 ns) in higher-end systems such as the VAX 6000 Model 200 and at 11.11 MHz (90 ns) in lower-end systems such as the MicroVAX 3500 and 3600. The 78034 was the first VAX microprocessor to have internal caches, a 1 KB combined instruction and data stream cache. The cache is quite unusual as it is implemented with one-transistor DRAM, whereas the majority ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MicroVAX
The MicroVAX is a discontinued family of low-cost minicomputers developed and manufactured by Digital Equipment Corporation (DEC). The first model, the MicroVAX I, shipped in 1984. The series uses processors that implement the VAX instruction set architecture (ISA) and were succeeded by the VAX 4000. Many members of the MicroVAX family have corresponding VAXstation variants, which primarily differ by the addition of graphics hardware. The MicroVAX family supports Digital's OpenVMS, VMS, ULTRIX, and VAXELN operating systems. Prior to VMS V5.0, MicroVAX hardware required a dedicated version of VMS named MicroVMS. MicroVAX I The MicroVAX I, code-named ''Seahorse'', introduced in October 1984, was one of DEC's first VAX computers to use very-large-scale integration (VLSI) technology. The KA610 CPU module (also known as the KD32) contains two custom chips which implemented the Arithmetic-logic unit, ALU and Floating-point unit, FPU while Transistor-transistor logic, TTL chips were use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
VAX 6000
The VAX 6000 is a discontinued family of minicomputers developed and manufactured by Digital Equipment Corporation (DEC) using processors implementing the VAX instruction set architecture (ISA). Originally, the VAX 6000 was intended to be a mid-range VAX product line complementing the VAX 8000, but with the introduction of the VAX 6000 Model 400 series, the older VAX 8000 was discontinued in favor of the VAX 6000, which offered slightly higher performance for half the cost. The VAX 6000 family supports Digital's OpenVMS, VMS and ULTRIX operating systems. Cabinet The VAX 6000 was housed in a cabinet which contained three card cages in the upper portion: a 14-slot XMI card cage on the right for CPU and memory modules, and optional VAXBI Bus hardware on the left. The VAXBI hardware distinguished two versions of the VAX 6000 platform, XMI-1 and XMI-2. XMI-1 differed from XMI-2 by requiring a DWMBA adapter and the presence of two 6-slot VAXBI channels, whereas in the XMI-2 platform, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microprocessor
A microprocessor is a computer processor (computing), processor for which the data processing logic and control is included on a single integrated circuit (IC), or a small number of ICs. The microprocessor contains the arithmetic, logic, and control circuitry required to perform the functions of a computer's central processing unit (CPU). The IC is capable of interpreting and executing program instructions and performing arithmetic operations. The microprocessor is a multipurpose, Clock signal, clock-driven, Processor register, register-based, digital integrated circuit that accepts binary code, binary data as input, processes it according to instruction (computing), instructions stored in its computer memory, memory, and provides results (also in binary form) as output. Microprocessors contain both combinational logic and sequential logic, sequential digital logic, and operate on numbers and symbols represented in the binary number system. The integration of a whole CPU on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Equipment Corporation
Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was co-founded by Ken Olsen and Harlan Anderson in 1957. Olsen was president until he was forced to resign in 1992, after the company had gone into precipitous decline. The company produced many different product lines over its history. It is best known for the work in the minicomputer market starting in the early 1960s. The company produced a series of machines known as the Programmed Data Processor, PDP line, with the PDP-8 and PDP-11 being among the most successful minis in history. Their success was only surpassed by another DEC product, the late-1970s VAX "supermini" systems that were designed to replace the PDP-11. Although a number of competitors had successfully competed with Digital through the 1970s, the VAX cemented the company's place as a leading vendor in the computer space. As microcomputers improved in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Instruction Set Architecture
In computer science, an instruction set architecture (ISA) is an abstract model that generally defines how software controls the CPU in a computer or a family of computers. A device or program that executes instructions described by that ISA, such as a central processing unit (CPU), is called an ''implementation'' of that ISA. In general, an ISA defines the supported instructions, data types, registers, the hardware support for managing main memory, fundamental features (such as the memory consistency, addressing modes, virtual memory), and the input/output model of implementations of the ISA. An ISA specifies the behavior of machine code running on implementations of that ISA in a fashion that does not depend on the characteristics of that implementation, providing binary compatibility between implementations. This enables multiple implementations of an ISA that differ in characteristics such as performance, physical size, and monetary cost (among other things), but t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DRAM
Dram, DRAM, or drams may refer to: Technology and engineering * Dram (unit), a unit of mass and volume, and an informal name for a small amount of liquor, especially whisky or whiskey * Dynamic random-access memory, a type of electronic semiconductor memory * Dram, Welsh term for a minecart, a small railway cargo truck used in a mine railway Currency and geography * Dram, Armenian for "money" ** Armenian dram, a monetary unit ** Artsakh dram (formerly ''Nagorno-Karabakh dram''), a monetary unit * Dram, the Tibetan name for the town of Zhangmu on the Nepal-Tibet border * Historic English name for Drammen, Norway Music * DRAM (musician) (Shelley Marshaun Massenburg-Smith, born 1988), American rapper and actor * Database of Recorded American Music, an online resource * The Drams, an American band made up of members of Slobberbone See also * Dram shop, a bar, tavern or similar commercial establishment where alcoholic beverages are sold * Dirham The dirham, dirhem or drah ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Die (integrated Circuit)
A die, in the context of integrated circuits, is a small block of semiconducting material on which a given functional circuit is Semiconductor fabrication, fabricated. Typically, integrated circuits are produced in large batches on a single wafer (electronics), wafer of electronic-grade Monocrystalline silicon, silicon (EGS) or other semiconductor (such as Gallium arsenide, GaAs) through processes such as photolithography. The wafer is cut (wafer dicing, diced) into many pieces, each containing one copy of the circuit. Each of these pieces is called a die. There are three commonly used plural forms: ''dice'', ''dies,'' and ''die''. To simplify handling and integration onto a printed circuit board, most dies are integrated circuit packaging, packaged in List of electronic component packaging types, various forms. Manufacturing process Most dies are composed of silicon and used for integrated circuits. The process begins with the production of Single crystal, monocrystalline sili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluminium Interconnect
In integrated circuits (ICs), interconnects are structures that connect two or more circuit elements (such as transistors) together electrically. The design and layout of interconnects on an IC is vital to its proper function, performance, power efficiency, reliability, and fabrication yield. The material interconnects are made from depends on many factors. Chemical and mechanical compatibility with the semiconductor substrate and the dielectric between the levels of interconnect is necessary, otherwise barrier layers are needed. Suitability for fabrication is also required; some chemistries and processes prevent the integration of materials and unit processes into a larger technology (recipe) for IC fabrication. In fabrication, interconnects are formed during the back-end-of-line after the fabrication of the transistors on the substrate. Interconnects are classified as ''local'' or ''global'' interconnects depending on the signal propagation distance it is able to support. The wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rigel (microprocessor)
Rigel was a microprocessor chip set developed and fabricated by Digital Equipment Corporation (DEC) that implemented the VAX instruction set architecture (ISA). It was introduced on 11 July 1989 with the introduction of the VAX 6000#VAX 6000 Model 4x0, VAX 6000 Model 400, the first system to feature the chip set. Rigel was also used in the VAX 4000 Model 300 and VAXstation 3100 Model 76. Production Rigel CPUs were rated at 35 to 43 MHz. The Rigel chipset consisted of several devices: *REX520 central processing unit (also known as the DC520 or "P-chip") *DC523 floating-point unit (codenamed ''KIWI'' or "F-chip" during development) *DC592 cache controller (codenamed ''COW'' or "C-chip" during development) *DC521 clock chip In addition, two further devices implemented the VAX vector processor option; these comprised the DC555 Vector Register set chip (''VERSE'') and the DC556 Vector Data Path chip (''FAVOR''). Support chips for Rigel-based systems included the RSSC (Rigel Sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
