Hi!
I posted a message a few days ago.
I'll try to be more specific.
I think the only thing I'm doing not right yet are the RAM access routines.
Poking is a two step process, something like (write enable assumed):
<0xf100
-----
/ \
1.lda $f000,x (x=0xf0 for example)
2.cmp $f72b
This will poke 0xf0 to to location $f72b.
I need to know what kind of instructions will be used for value
specification,
so far I take absolut, absolut-x, absolut-y, indirect-x and indirect-y.
What kind of instructions will be used for poking?
(absolut, absolut-x, absolut-y, indirect-x and indirect-y)
I know for sure CMP,AND,BIT,LDA, are there any others?
How is the value determined using indirect-x and indirect-y?
How is the address determined using indirect-x and indirect-y?
Which instruction preserve the value, which instructions don't?
(All implied instruction?) (for sure I know: NOP,TAX,TAY)
Since address fields below 0xf000 initiate a poke, what about addresses in
that
region that are poked to, is it possible, if so can a poke follow directly?
Bye Chris
PS. My stella now runs Frogger, Dragonstomper, Rabbit and a few others
It doesn't run (well) Suicide Mission, Phasor Patrol, Communists...
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