Routines
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27892: Check whether Sam is at the right place to pick up a telephone
Used by the routine at 29854. 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 230 (Sam)
27892 CALL 63138 Calculate the x-coordinate of the front column of Sam's sprite (x)
27895 LD B,A B=x%8
27896 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)
27897 CP 6
27899 SBC A,A
27900 LD A,B A=x%8
27901 LD B,2 Bit 1 set: check for the presence of a telephone
27903 RET
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