I don't understand what you mean by "the enemies can he come?".
I'll tell you what's happening with that instruction: It is moving the value from register D0 to RAM address FF23FE. The value in register D0 is 0002, so RAM address FF23FE will now be 0002.
I'll tell you what's happening with that instruction: It is moving the value from register D0 to RAM address FF23FE. The value in register D0 is 0002, so RAM address FF23FE will now be 0002.

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