Routines
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6648: Check whether a character is on a staircase
Used by the routines at 6652, 66AA, 6CAF, 6E90, F499 and F650. Returns with the zero flag set if the character is not on a staircase.
Input
D Character's y-coordinate
6648 LD A,D A=character's y-coordinate
This entry point is used by the routines at 69F6, 6D1C, 6F1E, 7000 and F9E5 with A holding the character's y-coordinate.
6649 CP $9B Is the character on the top floor?
664B RET Z Return with the zero flag set if so
664C CP $A2 Is the character on the middle floor?
664E RET Z Return with the zero flag set if so
664F CP $A9 Is the character on the top floor?
6651 RET Return with the zero flag set if so
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