Hopefully, the higher priced compiler will choose the right one. Maybe=20
not, Marketing will want the faster compile.

As I recall, the Z80 had two sets of registers which allowed for a=20
single cycle context switch without interrupt handling overhead. I am=20
not aware of anyone using it.  IBM had a line of processors that AFIK=20
were used only in complete devices that used the same technique to move=20
between program levels. I wonder if any of the current micro's have that=20
type of architecture now days.

John  de W8CCW

On 8/22/2014 12:29 PM, John Coppens wrote:
> It's been many a year since I programmed Z80, but I seem to remember ther=
e
> are 2 and 3 byte jumps. If the destination address is after the jump, the
> assmebler doesn't have any option but to use the 3-byte address as it doe=
sn't
> know yet how far to jump. Unless you promise in the source code that the
> jump will be 'near'

--=20
John Ferrell W8CCW
    Julian NC 27283
  It is better to walk alone,
than with a crowd going the wrong direction.
                   --Diane Grant


--=20
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