Routines
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63152: Check whether a character is standing next to a light switch or window blind
Used by the routines at 30092 and 63209. Returns with the zero flag reset if the character is standing next to a light switch or a window that has a blind, and with the bit set in A identifying the fixture that was found.
Input
H Character number (215-230)
63152 LD L,4 Point HL at byte 4 of the character's buffer
63154 BIT 0,(HL) Is the character indoors?
63156 RET Z Return if not
63157 CALL 63138 Collect in C the x-coordinate of the front column of the character's sprite
63160 LD B,128 Bit 7 set: check for a light switch at the left side of the room
63162 JR Z,63184 Jump if C=0 mod 8
63164 LD B,16 Bit 4 set: check for a blind on the left-hand window
63166 SUB 3 Does C=1 or 2 mod 8?
63168 JR C,63184 Jump if so
63170 LD B,4 Bit 2 set: check for a blind on a large central window
63172 SUB 2 Does C=3 or 4 mod 8?
63174 JR C,63184 Jump if so
63176 LD B,8 Bit 3 set: check for a blind on the right-hand window
63178 SUB 2 Does C=5 or 6 mod 8?
63180 JR C,63184 Jump if so
63182 LD B,64 Bit 6 set: check for a light switch at the right side of the room (when C=7 mod 8)
63184 PUSH BC Save the fixture identifier bit (in B)
63185 CALL 62548 Is the character standing next to a light switch or a window that has a blind?
63188 JR NZ,63193 Jump if so
63190 POP AF Restore the fixture identifier bit to A (though we don't need it now)
63191 XOR A Set the zero flag
63192 RET
63193 POP AF Restore the fixture identifier bit to A
63194 AND A Reset the zero flag
63195 RET
 Prev: 63138 Up: Map Next: 63196