> >> I don't know. But I think it's possible to "add" this instructions.
(-;
> >> In the same way as ADVRAM works, but doing a "bridge" over Z180.
> >Hmmm... How will the registers be read then???
>
> I think that, if it's possible, it'll be a DIRTY service... (-;
Yes. And I really have no idea how he is planning to do it...
> >Sometimes you need extra registers. And they aren't that slow. I use IX
and
> >IY a lot. I don't use IXh / IXl etc. often, but Patriek uses them often
in
> >GEM for example.
>
> Yes, and if he find a way to remove them, the emulation will be a
> lot faster... (-;
Not. It is a common mistake to think the IX/IY registers serve no good. They
are not that slow at all, and since Patriek uses a lot of lookup tables
(that's what they are made for), they can be pretty useful.
Example: You've got a block of copy-data stored in RAM. You want to change
DX, NX, and the color.
The HL way (HL pointing to DX):
LD (HL),A
INC HL
INC HL
INC HL
INC HL
LD (HL),A
INC HL
INC HL
INC HL
INC HL
LD (HL),A
The IX way (IX pointing to the start of the copy):
LD (IX+4),A
LD (IX+8),A
LD (IX+12),A
What is faster... You may guess...
~Grauw
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