Routines
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62905: Check whether ERIC is standing on a boy who's been knocked out
Used by the routine at 62771. Returns with the carry flag set if ERIC is standing on a boy.
Input
B 11 (there are 11 little boys)
D 1 + ERIC's y-coordinate
E ERIC's x-coordinate
H 152 (little boy no. 1)
62905 LD C,E Set E=x-1 and C=x+2 where x is ERIC's x-coordinate; any boy with an x-coordinate in this range is a potential step for ERIC
62906 DEC E
62907 INC C
62908 INC C
62909 LD L,97 Byte 97 of the boy's buffer holds his y-coordinate
This entry point is also used by the routine at 62771 with H=167 (BOY WANDER) and B=3 (and E and C already set as above).
62911 LD A,D A=y+1 (y=ERIC's y-coordinate)
62912 CP (HL) Is there a boy at this y-coordinate?
62913 JR NZ,62932 Jump if not
62915 DEC L Collect the boy's animatory state from byte 96 of his buffer
62916 LD A,(HL)
62917 INC L L=97
62918 AND 15 Keep only bits 0-3 of the animatory state
62920 CP 7 Is the boy lying flat on his back?
62922 JR NZ,62932 Jump if not
62924 INC L Collect the boy's x-coordinate from byte 98 of his buffer
62925 LD A,(HL)
62926 DEC L L=97
62927 CP E Return with the carry flag set if ERIC is standing on this boy; otherwise continue
62928 JR C,62932
62930 CP C
62931 RET C
62932 INC H Next boy
62933 DJNZ 62911 Jump back until all the boys have been checked
62935 AND A Return with the carry flag reset to indicate that ERIC is not standing on a boy
62936 RET
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