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Routines |
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Used by the routine at 62771. Returns with the carry flag set if ERIC is standing on a boy.
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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).
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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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