Author: Alan McCracken
Date: 09:51:28 01/22/05
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On January 21, 2005 at 11:12:10, Matthew Hull wrote: >On January 21, 2005 at 10:39:17, Steve B wrote: > >>Significant strides in terms of playing strength were made in the Dedicated >>chess computer market once the industry utilized the Motorola 68000 16 bit >>Processor > > >"The MC68000 external data bus and internal data paths are 16 bits wide, and the >CPU may fetch and process two bytes at a time from memory. However, any 68000 >CPU regardless of data bus size is properly called a 32-bit machine...because >the largest operand handled by a majority of 68000 data operations is 32 bits >wide." > >--Microcomputer Architecture and Programming (1981), pp 434, John F. Wakerly Wakerly isn't giving the all data. The 68000 can't deal with 32 bits all at once, it can store it, not compute in a single operation. It's bus is ony 24 bits wide. This isn't what distingishes a 32 bit chip. Many use to call the 68000 a 16/32 bit processor, but some said it's 16 bit primarily and thus should be called a 16 bit processor, no waffling. Motorola never called it a 32 bit chip. They said it was 16 bit, and due to the registers, would play with the term 16/32bit. > > > >> >>the processor was especially suitable for the types of instructions used to >>calculate a chess move >> >>eventually 68020 32 bit and 68030 and 68040 processors were also used >> >>here is the very first chess computer to incorporate the 68000 16 bit processor >> >>The Legendary Mephisto Excalibur: >> >> >>http://pg.photos.yahoo.com/ph/cpaa2@sbcglobal.net/detail?.dir=3353&.dnm=e674.jpg&.src=ph >> >>Best >>Steve
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