12 Nov
2006
12 Nov
'06
3:57 p.m.
Chuck Guzis wrote:
That wasn't my claim; I said that "had IBM
decided to release the
5170 as an 8 MHz machine..." when comparing with a 5160. Right
there, you start off with a cycle time that's nearly twice as fast.
Yes, but twice != five times as fast. They didn't improve every single
opcode's time... the core ones like ADC went from 3 cycles to 2... MOV
involving registers stayed the same... JMPs are only one cycle faster if
jump isn't taken... etc.
A lot of the esoteric opcodes like XLAT and AAD were dramatically
improved, as were MUL/DIV but those aren't exactly basic building blocks
of all applications.
If anyone has a 5150/60 with an 4.77MHz CPU clock and
an 8 MHz 5170
handy I'd be interested to hear the results of SI and SPEED numbers.
I can probably do it if no one volunteers.
I would suggest you ditch Norton SI and instead use MIPS.COM which is
much more granular and has defaults for exactly your test case machines.
--
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