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R800 (CPU)
The R800 is the central processing unit used in the MSX Turbo-R home computer. The R800 was designed by ASCII Corporation of Japan and built by Mitsui & Co The goal was a modern and pipelined CPU binary compatible with the Z80, and therefore with MSX software, while also maintaining compatibility with older MSX Z80-based hardware. Compatibility During the development of the MSX Turbo R, ASCII Corporation considered various processors, both compatible and incompatible with the Z80, as candidates. At that time, Kazuya Kishioka , a company employee, was researching and developing an ASIC that was a high-speed version of the Z80 and largely customized for the MSX architecture. For software compatibility with older MSX software, the R800 uses the same instruction set as the Z80, with only minor but useful additions, such as 8x8-bit and 16x16-bit multiplication instructions called MULUB (8-bit), and MULUW (16-bit). Also, many of the undocumented Z80 instructions were made official, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
R800 02
R8 or R-8 may refer to: * Audi R8, used since 1999 by Audi for Le Mans 24 Hours race cars, and since 2007 for a street legal car ** List of Audi R8 automobiles * Machine_taper#R8, R8 Machine taper, originally designed for Bridgeport Milling Machines * R8 (Rodalies de Catalunya), a commuter rail line bypassing Barcelona, Catalonia, Spain * SEPTA Regional Rail, R8 (SEPTA), a commuter rail line in Philadelphia, United States, which has been split into: ** Chestnut Hill West Line: ''(R8 Chestnut Hill West)'' ** Fox Chase Line: ''(R8 Fox Chase)'' * R8: Contact with combustible material may cause fire, a risk phrase in chemistry * HK R8, a modified version of the Heckler & Koch SL8#HK R8, Heckler & Koch SL8 rifle * Smith & Wesson Model 327, Smith & Wesson M&P R8, a .357 Magnum revolver * HP roman8, an 8-bit character set * Kaliningrad K-8, a medium-range air-to-air missile known as R-8 in service * Kyrgyzstan Airlines, from its IATA airline designators * Leica R8, a 1996 manual focus 35&nb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |