Date   : Wed, 29 Apr 2009 21:39:31 +0100
From   : jumbos.bazzar@... (Mark Haysman)
Subject: Odd behaviour of the STA &****,X command?

Hi folks.

As I'm fiddling with a project I've noticed something odd seems to be 
happening when the STA command is used to store to a location.

If the command is used without the index - IE: STA &FC40 -  the CPU makes 
one write to the memory location as you'd expect, but if you use the X 
index - STA &FC40,X -  it seems to perform a read immediately afterwards 
from the same location. Is that "normal" behaviour for the 6502, or is my 
CPU (or scope (or brain)) screwey?

Thanks, Mark.