Routines
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F9E5: Compare a character's coordinates with ERIC's
Used by the routine at F78E. On entry, the zero flag is set if ERIC's y-coordinate matches that of the character looking for him. On exit, the zero flag is set if the character looking for ERIC is within 3 y-coordinates of ERIC's location and not on a staircase (in which case the routine at F78E checks whether the character is also within 3 x-coordinates of ERIC's location, i.e. has found ERIC).
Input
A Character's y-coordinate
D ERIC's y-coordinate
H Character number (0xA1, 0xA3, 0xA4)
L 0x61
F9E5 JR Z,\$F9F2 Jump if ERIC and his chaser are on the same floor
F9E7 SUB D A=absolute difference between the y-coordinates of ERIC and his chaser
F9E8 JR NC,\$F9EC
F9EA NEG
F9EC CP \$04 Are ERIC and his chaser within 3 y-coordinates of each other?
F9EE JR C,\$F9F2 Jump if so
F9F0 AND A Reset the zero flag (ERIC has not been found)
F9F1 RET
F9F2 LD A,(HL) A=y-coordinate of the character looking for ERIC
F9F3 JP \$6649 Set the zero flag set if the character is not on a staircase
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