64-bit definition architecture
A term describing a computer architecture based around an ALU
and data bus
which are 64 bit
64-bit processors were quite common in 1996, e.g. Digital Alpha
, versions of Sun SPARC
AS/4000. the PowerPC
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
(partialy). A 32-bit OS can run on a 64-bit CPU.