Routines
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6CF4: Check whether Sam is at the right place to pick up a telephone
Used by the routine at 749E. Returns with the zero flag reset if the x-coordinate of the front column of Sam's sprite is between 1 and 6 mod 8 (which is where telephones are located in rooms).
Input
H 0xE6 (Sam)
6CF4 CALL $F6A2 Calculate the x-coordinate of the front column of Sam's sprite (x)
6CF7 LD B,A B=x%8
6CF8 DEC A Set the zero flag if x is 0 or 7 mod 8 (telephones are located at x-coordinates between 1 and 6 mod 8)
6CF9 CP $06
6CFB SBC A,A
6CFC LD A,B A=x%8
6CFD LD B,$02 Bit 1 set: check for the presence of a telephone
6CFF RET
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