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  3. April 2003

48-bit RISC

Hi Everyone,

I am not sure if this question is right for this forum, or whether it
has been asked before.

When IBM first advertised RISC on the AS/400, it was a case of "64 bits,
no buts...". That implied 64-bit all the way through! Now, was the old
SPD technology on the CISC machines 48 or 64 bit? Why do we have 'low
speed' and 'high speed' slots on the older RISC machines?

In my mind, the SPD technology is 48 bit, with the low speed slots on
the RISC systems there to accommodate 48-bit within the RISC
environment. Am I wrong in my assumptions? Please enlighten.

I know that this probably has no bearing on the new equipment; it is
just that the recent discussion regarding the 'new' 64-bit OS's that are
due have brought this to mind again.

Thanks.

Jan.

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