64-bit
<architecture> A term describing a computer architecture based around an
ALU, registers and data bus which are 64 bits wide.
64-bit processors were quite common in 1996, e.g. Digital Alpha, versions of Sun
SPARC, MIPS, IBM AS/4000. the PowerPC and Intel were expected to move to 64 bits
at their next generation - PPC 620 and Intel P7.
A 64-bit address bus allows the processor to address 18 million gigabytes as
opposed to the mere 4 gigabytes allowed with 32 bits. There were in 1996 already
hard disks which can hold over 4GB. Floating point calculations can also be more
accurate.
A 64-bit OS is needed as well to take advantage of the CPU. In 1996 there were
only a few 64-bit operating systems, including OS/400, Digital Unix, Solaris
(partialy). A 32-bit OS can run on a 64-bit CPU.
(2004-05-12)
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