21 Nov
2007
21 Nov
'07
6:07 p.m.
On Tuesday 20 November 2007 21:00, Jim Leonard wrote:
The only thing I can think of that might substantiate
this claim is when
you were working with 32-bit registers in 16-bit DOS. Each instruction
needed a 66h or 67h prefix opcode to indicate 32-bit. This was wasteful
on a 386sx because the 16-bit memory interface ate more time fetching
the additional opcodes than you were saving by using 32-bit registers
(!).
This is one of the things that's always bugged me about those "extra" z80
instructions...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin