Routines
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A921: Check If Active Character
Used by the routines at Handler_Move_Characters, Handler_PickUpObjects, B288 and Handler_ChangeCharacters.
Input
IY Character pointer
F Zero flag is set if the given character is active
Character_Active A921 PUSH IY HL=IY.
A923 POP HL
A924 LD DE,($B09D) DE=*CurrentCharacter.
A928 AND A Reset the flags.
Simply subtract one character address pointer from the current character pointer.
A929 SBC HL,DE HL-=DE.
A92B RET Return.
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