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Encyclopedia > Ricoh 5A22

The Ricoh 5A22 is the microprocessor CPU produced by Ricoh for the Super Nintendo Entertainment System (SNES) video game console. The 5A22 is based around the 16-bit CMD/GTE 65c816, itself a version of the WDC 65C816 (used in the Apple IIGS personal computer). Microprocessors, including an Intel 80486DX2 and an Intel 80386. ... Intel 80486DX2 microprocessor in a ceramic PGA package A central processing unit (CPU), or sometimes simply processor, is the component in a digital computer that interprets instructions and processes data contained in software. ... Ricohs former logo (-August 2005) Ricoh Company, Ltd. ... The Super Nintendo Entertainment System, also known as Super Nintendo, Super NES or SNES, is a 16-bit video game console released by Nintendo in North America, Brazil, Europe, and Australia. ... In computer science, 16-bit is an adjective used to describe integers that are at most two bytes wide, or to describe CPU architectures based on registers, address buses, or data buses of that size. ... If you were looking for the Western Digital Corporation, see Western Digital. ... The W65816 (also: 65C816), a 16-bit microprocessor developed by the Western Design Center (WDC), is an expanded and compatible successor to the venerable MOS Technology 6502. ... The Apple IIGS, the fifth model inception of the Apple II, was the most powerful member of the Apple II series of personal computers made by Apple Computer. ...


Major features

In addition to the 65C816 CPU core, the 5A22 contains support hardware, including:

  • Controller port interface circuits
  • Circuitry for generating NMI interrupts on Vblank
  • Circuitry for generating PSG sound with included 2A03 core
  • Circuitry for generating IRQ interrupts on screen positions
  • A DMA unit, supporting two primary modes:
    • General DMA, for block transfers at a rate of 2.68MB/s
    • Hblank DMA, for transferring small data sets at the end of each scanline outside of the active display period
  • Multiplication and division registers

A Non-Maskable Interrupt (NMI) is a special type of interrupt that can not be ignored by standard interrupt masking techniques. ... In computer science, an interrupt is an asynchronous signal from hardware or software indicating the need for attention. ... The vertical blanking interval (VBI) is an interval in a television or VDU signal that temporarily suspends transmission of the signal for the electron gun to move back up to the first line of the television screen to trace the next screen field. ... In computer science, an interrupt is a signal from a device which typically results in a (register) context switch: that is, the processor sets aside what its doing and does something else. ... In computer science, an interrupt is an asynchronous signal from hardware or software indicating the need for attention. ... Direct memory access (DMA) allows certain hardware subsystems within a computer to access system memory for reading and/or writing independently of the CPU. Many hardware systems use DMA including disk drive controllers, graphics cards, network cards, and sound cards. ... A scanline is a line on a CRT tube, made up of dots. ... In mathematics, multiplication is an arithmetic operation which is the inverse of division, and in elementary arithmetic, can be interpreted as repeated addition. ... In mathematics, especially in elementary arithmetic, division is an arithmetic operation which is the inverse of multiplication, and sometimes it can be interpreted as repeated subtraction. ...

Performance

The CPU as a whole employs a variable-speed system bus, with bus access times determined by the memory location accessed. The possible clock speeds are 1.79, 2.68 and 3.58 MHz. For most purposes, however, the bus runs at 2.68 MHz and drops to 1.79 MHz when accessing certain PPU registers. It works at approximately 1.5 MIPS (using strictly 16-bit instructions) and has a theoretical peak of 1.79 million 16-bit adds per second. Front Side Bus (FSB) is the term used to describe the CPU data bus. ... In synchronous digital electronics, such as most computers, a clock signal is a signal used to coordinate the actions of two or more circuits. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... Instructions per second (IPS) is a measure of a computers processor speed. ...



65xx-series CPUs from MOS Technology, second source/clone vendors, and the Western Design Center

MOS 4510MOS 6501MOS 6502WDC 65C02Hudson HuC6280 ● Ricoh 2A03 ● MOS 6507MOS 6508MOS 6509
MOS 6510 (and 7501, 8500, 8501) ● MOS 8502WDC 65802WDC 65816Ricoh 5A22 ● Nintendo SA-1 Image File history File links MOS_Technology. ... Image File history File links WDClogo_small. ... MOS Technology 65xx is a family of 8-bit microprocessors from MOS Technology, based on the Motorola 6800 (introduced ca. ... Intel 80486DX2 microprocessor in a ceramic PGA package A central processing unit (CPU), or sometimes simply processor, is the component in a digital computer that interprets instructions and processes data contained in software. ... MOS Technology, Inc. ... If you were looking for the Western Digital Corporation, see Western Digital. ... The MOS Technology 4510 was the MOS-manufactured microcomputer chip used in the (unreleased) Commodore 65 8-bit home/personal computer. ... The 6501 is an eight-bit microprocessor, the first sold by MOS Technology. ... The MOS Technology 6502 is an 8-bit microprocessor designed by MOS Technology in 1975. ... WDC 65C02 Microprocessor // Introduction The W65C02S is a low power, cost effective 8-bit microprocessor. ... The HuC6280 8-bit microprocessor is Japanese company Hudson Softs improved version of the WDC 65C02 CPU. The most notable product using the HuC6280 is NECs TurboGrafx 16 video game console. ... The 6507 is an 8-bit microprocessor from MOS Technology, Inc. ... The MOS Technology 6508 was an 8-bit microprocessor designed by MOS Technology. ... The MOS Technology 6509 was an enhanced version of the popular 6502 microprocessor, capable of addressing up to 1 megabyte of RAM via bank switching. ... The MOS Technology 6510, also known as MOS Technology / Commodore Semiconductor Group (CSG) 8500, is a microprocessor designed by MOS Technology, and is a direct successor of the very successful 6502. ... The MOS Technology 8502 was MOSs microprocessor used as one of the two¹ CPUs in the Commodore 128 home/personal computer. ... The WDC 65816 (also: 65C816), a 16-bit microprocessor CPU developed by the Western Design Center (WDC), is an expanded and compatible successor to the venerable MOS Technology 6502. ... The WDC 65816 (also: 65C816), a 16-bit microprocessor CPU developed by the Western Design Center (WDC), is an expanded and compatible successor to the venerable MOS Technology 6502. ... The Nintendo SA-1 is a microprocessor developed by Nintendo for use in Super Nintendo Entertainment System (SNES) game cartridges. ...


 
 

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