Hi,

Newbie question here!

So I want to store a value at memory location $5940.

I have another routine which calculates this memory location and it stores it in zero page as this

Location $70 = $40
Location $71 = $59

So I thought I could indirectly store to this location using:

LDA value to be stored
LDX #0
STA (&70),X

But I can't get this to work, I'd appreciate some advise.

Thanks.

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Thanks for your response, I found this explanation too:

INDIRECT INDEXED ADDRESSING - In indirect indexed addressing (referred to as ( Indirect) , Y), the second byte of the instruction points to a memory location in page zero.
The contents of this memory location is added to the contents of the Y index register, the result being the low order eight bits of the effective address.

So this should work:

Location $70 = $40
Location $71 = $59

LDA value to be stored
LDY #0
STA (&70),Y

Which should store data in $5940 (made up from $59$40 with zero offset)

Is that correct?

_________________
x86?  We ain't got no x86.  We don't NEED no stinking x86!

Perfect! Thanks for your responses.

(its a 6502 I'm programming for... Also a BBC Micro which uses & for hex...)

Cheers.