Author: Anthony Cozzie
Date: 11:03:16 01/17/03
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On January 17, 2003 at 13:12:01, Dana Turnmire wrote: >The Novag Star Diamond is advertized as follows: > >* Estimated Rating: 2400-2550 at 40 moves in 2 hours. > >* Advanced SH7034 RISC processor with 1M program memory and 256K working area, >running at 20 MHz. > > The 2400-2550 rating is equal to the ratings at SSDF of programs running on >450 MHz Pentium chips. Does the RISC chip run 22.5 times faster than the >pentium chip? Would a RISC processor running at 450 MHZ be equal to a pentium >running at 10 GHz? If the RISC chip is that much faster why could one not run >an operating system with that chip? > >One last question. Would anyone know who the programmer is behind the Novag >Star Diamond? RISC stands for Reduced Instruction Set Computing. In the x86 instruction set (CISC) you will find lots of fancy instructions like "copy a string from A to B while setting flags here and do this the number of times specified in register C while doing ....." etc. A RISC instruction set is much simpler: ADD, LOAD, STORE, etc. Now, CISC instructions are great for code density, but they are hell for computer architects. Stuff like instruction fetch and pipelining are difficult on CISC machines. This is why modern X86 processors are actually RISC processors on this inside. In other words, RISC is not a magic keyword to better performance :) anthony
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