Ok, gotcha about the offset.
...Sorry, what do you mean exactly? I can't ask anything about MAME programming because I have to learn it by myself?
If not so (and you can continue to answer to my questions)... Can you be more specific about use of AM_MIRROR (some examples)?
It is equivalent to the statement i wrote above? If so, why I have to use: AM_RANGE(0x1000, 0x1003) AM_MIRROR(0x3FC)
and not: AM_RANGE(0x1000, 0x13FF) therefore without AM_MIRROR usage?
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