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CPU and has
At its core, the Amiga has a custom chipset consisting of several coprocessors, which handle audio, video and direct memory access independently of the Central Processing Unit ( CPU ).
Since the 1970s the microprocessor class of CPUs has almost completely overtaken all other CPU implementations.
Additionally, as the ability to construct exceedingly small transistors on an IC has increased, the complexity and number of transistors in a single CPU has increased many fold.
This widely observed trend is described by Moore's law, which has proven to be a fairly accurate predictor of the growth of CPU ( and other IC ) complexity.
This microprogram is sometimes rewritable so that it can be modified to change the way the CPU decodes instructions even after it has been manufactured.
This has the advantage of simplifying the CPU significantly, both from a design perspective and a component-count perspective.
This limitation has largely been compensated for by various methods of increasing CPU parallelism.
This has led many modern CPUs to require multiple identical clock signals to be provided to avoid delaying a single signal significantly enough to cause the CPU to malfunction.
Also in case of Single Instructions Multiple Data — a case when a lot of data from the same type has to be processed, modern processors can disable parts of the pipeline so that when a single instruction is executed many times, the CPU skips the fetch and decode phases and thus greatly increases performance on certain occasions, especially in highly monotonous program engines such as video creation software and photo processing.
In this scheme, each CPU has additional hardware to maintain a constantly up-to-date view of memory.
In modern systems the performance difference between the CPU and main memory has grown so great that increasing amounts of high-speed memory is built directly into the CPU, known as a cache.
Like the 1541 and 1571, the 1581 has an on board MOS Technology 6502 CPU with its own ROM and RAM, and uses a serial version of the IEEE-488 interface.
A CPU design project generally has these major tasks:
The demands of being able to run a wide range of programs efficiently has made these CPU designs among the more advanced technically, along with some disadvantages of being relatively costly, and having high power consumption.
When a new symbol has been entered, the device typically sends an interrupt to alert the CPU to read it.
When the keyboard processor detects that a key has changed state, it sends a signal to the CPU indicating the scan code of the key and its new state.
When either writing through or directly to physical device registers, this may, but not necessarily, cause a real interrupt to occur at the device's central processor unit ( CPU ), if it has one.
On recent motherboards, the BIOS may also patch the central processor microcode if the BIOS detects that the installed CPU is one in for which errata has been published.
Myrinet has much lower protocol overhead than standards such as Ethernet, and therefore provides better throughput, less interference, and lower latency while using the host CPU.
One major barrier to pipelining was that some instructions, like division, take longer to complete and the CPU therefore has to wait before passing the next instruction into the pipeline.
This may be interesting in cases where the egress router has lots of packets leaving MPLS tunnels, and thus spends inordinate amounts of CPU time on this.
Even if the cost of a CPU that has integrated peripherals is slightly more than the cost of a CPU and external peripherals, having fewer chips typically allows a smaller and cheaper circuit board, and reduces the labor required to assemble and test the circuit board.

CPU and 8-bit
** 8-bit CPU, 16-bit address space
For example, an 8-bit CPU deals with a range of numbers that can be represented by eight binary digits ( each digit having two possible values ), that is, 2 < sup > 8 </ sup > or 256 discrete numbers.
This was an advanced 8-bit CPU design, having, among other things, limited 16-bit capabilities.
IBM designed the 8-bit version as a buffered interface to the external bus of the Intel 8088 ( 16 / 8 bit ) CPU used in the original IBM PC and PC / XT, and the 16-bit version as an upgrade for the external bus of the Intel 80286 CPU used in the IBM AT.
The 8-bit bus ran at 4. 77 MHz ( the clock speed of the IBM PC and IBM PC / XT's 8088 CPU ), while the 16-bit bus operated at 6 or 8 MHz ( because the 80286 CPUs in IBM PC / AT computers ran at 6 MHz in early models and 8 MHz in later models.
This meant that in spite of its modest 8-bit CPU the system compared well against the 16-bit machines in the market at the time.
With the change from mini-computers to micro-computers a few years later, even a " single user PC " with a single 8-bit CPU with 16K or 64K of memory could support multiple users, running dumb terminals in command line mode.
The Motorola 6809 is an 8-bit ( with some 16-bit features ) microprocessor CPU from Motorola, designed by Terry Ritter and Joel Boney and introduced 1978.
The die ( integrated circuit ) | die from an Intel 8742, an 8-bit microcontroller that includes a CPU running at 12 MHz, 128 bytes of RAM, 2048 bytes of EPROM, and Input / output | I / O in the same chip.
The bit shift operation requires a small amount of CPU overhead, whereas conventional 8-bit playback is almost entirely DMA driven.
The TurboGrafx-16 has an 8-bit CPU and a dual 16-bit GPU ; and is capable of displaying 482 colors simultaneously, out of 512.
The Z80 and its derivatives and clones make up one of the most commonly used CPU families of all time, and, along with the MOS Technology 6502 family, dominated the 8-bit microcomputer market from the late 1970s to the mid-1980s.
The CPU loads one 8-bit number into R1, multiplies it with R2, and then saves the answer from R3 back to RAM.
It was an 8-bit CPU with an external 14-bit address bus that could address 16KB of memory.
* The Master System's CPU is an 8-bit Zilog Z80.
Each CPU is given a number ( typically only 8-bit to 16-bit ), which is its network address, and packets to CPUs are sent with this number in the header.
Like previous PCW models, the PcW16 used the 8-bit Zilog Z-80 CPU, which first appeared in 1976, while other personal computers used 16-bit CPUs or the more recent 32-bit CPUs.
As 8-bit CPU machines became widely accepted, the number of portables increased rapidly.
It contains a 8-bit Renesas ( Then a part of Hitachi ) H8 / 300 microcontroller as its internal CPU.
Apple's portion of the computer industry at this time was transitioning from the 8-bit 6502 CPU technology that started it, to the newer 16 / 32 bit Motorola 68000 used by computers such as the Commodore Amiga and Atari ST and the Apple Macintosh.
It wasn't a simple pong based console system but a cartridge system with an 8-bit NEC D780C ( Z80 clone ) as CPU.
The SPC700 instruction set is quite similar to that of the 6502 CPU family, but includes additional instructions, including XCN ( eXChange Nibble ) which swaps the upper and lower 4-bit portions of the 8-bit accumulator, and an 8-by-8-to-16-bit multiply instruction.
The Sony SPC 700 is the S-SMP's integrated 8-bit CPU core manufactured by Sony with an instruction set similar to that of the MOS Technology 6502 ( as used in the Commodore 64 and Vic 20, Apple II, BBC Micro and the original NES ).
Its original design called for a single-chip 8-bit microprocessor for the CPU, rather than a conventional processor built from discrete TTL modules.

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