Routines
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63973: Compare a character's coordinates with ERIC's
Used by the routine at 63374. 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 63374 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 (161, 163, 164)
L 97
63973 JR Z,63986 Jump if ERIC and his chaser are on the same floor
63975 SUB D A=absolute difference between the y-coordinates of ERIC and his chaser
63976 JR NC,63980
63978 NEG
63980 CP 4 Are ERIC and his chaser within 3 y-coordinates of each other?
63982 JR C,63986 Jump if so
63984 AND A Reset the zero flag (ERIC has not been found)
63985 RET
63986 LD A,(HL) A=y-coordinate of the character looking for ERIC
63987 JP 26185 Set the zero flag set if the character is not on a staircase
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