[RC5] Porting to Atari?
j-zbiciak1 at ti.com
Sat Mar 21 23:43:36 EST 1998
'Alexander Li Cohen' said previously:
| While everyone has been talking of porting to an Atari, I had an
| idea. What's wrong with the 286. I've got one that I haven't turned on
| in almost a year, and I'm sure others are in the same situation. Would
| it be even slightly feasible to make a port to these dinosaurs we all
| used to have(or still have, as door stops!)?
The biggest problem with 16-bit and 8-bit machines is that their
fundamental machine word-size is too narrow for the flavor of RC5 we're
cracking. For instance, on a 286, I'd need a handful of instructions
(including a branch or two, probably) to properly perform a rotate,
whereas on a 386 and later it is one instruction.
I can't even remember if there is a "rotate by n based on register"
instruction in 286 asm... If there were, it's probably microcoded
to take 1 cycle per bit, since I don't think the 286 (or even the 386)
used a barrel rotator/shifter.
+----------- Joseph Zbiciak ----------+
| - - - - j-zbiciak1 at ti.com - - - - | Ignorance is the
|- http://www.primenet.com/~im14u2c/ -| Mother of Devotion.
| - - -Texas Instruments, Dallas- - - | -- Robert Burton
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