Routines
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37403: Flip a switch in a Kong Beast cavern if Willy is touching it
Used by the routine at 37173. Returns with the zero flag set if Willy flips the switch.
Input
HL Address of the switch's location in the attribute buffer at 23552
37403 LD A,(32876) Pick up the LSB of the address of Willy's location in the attribute buffer at 23552 from 32876
37406 INC A Is it equal to or one less than the LSB of the address of the switch's location?
37407 AND 254
37409 CP L
37410 RET NZ Return (with the zero flag reset) if not
37411 LD A,(32877) Pick up the MSB of the address of Willy's location in the attribute buffer at 23552 from 32877
37414 CP H Does it match the MSB of the address of the switch's location?
37415 RET NZ Return (with the zero flag reset) if not
37416 LD A,(32869) Pick up the sixth byte of the graphic data for the switch tile from 32869
37419 LD H,117 Point HL at the sixth row of pixels of the switch tile in the screen buffer at 28672
37421 CP (HL) Has the switch already been flipped?
37422 RET NZ Return (with the zero flag reset) if so
Willy is flipping the switch.
37423 LD (HL),8 Update the sixth, seventh and eighth rows of pixels of the switch tile in the screen buffer at 28672 to make it appear flipped
37425 INC H
37426 LD (HL),6
37428 INC H
37429 LD (HL),6
37431 XOR A Set the zero flag: Willy has flipped the switch
37432 OR A This instruction is redundant
37433 RET
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