Routines
Prev: 29088 Up: Map Next: 29149
29100: Send a policeman to Sam's last known whereabouts
Continues from the routine at 29559. The policeman recently spotted Sam while he was wearing a disguise unknown to the police; this routine sends that policeman back to where he first spotted Sam when the disguise becomes known.
Input
H 222 or 223 (policeman)
29100 LD L,31 Pick up byte 31 of the policeman's buffer
29102 LD A,(HL)
29103 AND 63 D=Sam's y-coordinate when he was spotted by the policeman while wearing a disguise unknown to the police
29105 LD D,A
29106 LD A,(HL) Pick up byte 31 again
29107 LD C,4 Initialise the destination z-coordinate to 4
29109 AND 192 Was Sam's z-coordinate 4 (on the sidewalk or road) when he was spotted?
29111 JR Z,29116 Jump if so
29113 RLCA Move bits 6 and 7 of A into bits 0 and 1
29114 RLCA
29115 LD C,A C=Sam's z-coordinate when he was spotted
29116 DEC L L=30
29117 LD E,(HL) E=Sam's x-coordinate when he was spotted
29118 CALL 29076 Set the policeman's destination coordinates to (E,D)
29121 CALL 29091 Copy the destination coordinates and location identifier to 32731
29124 LD L,29 Point HL at byte 29 of the policeman's buffer
This entry point is used by the routine at 29218.
29126 LD A,(HL) Pick up byte 29 of the policeman's buffer
29127 LD (HL),0 Set byte 29 of the policeman's buffer to 0 now that the disguise Sam was wearing is known to the police
29129 RLCA Move bits 5-7 of A (which hold the ID of the disguise that Sam was wearing) into bits 0-2
29130 RLCA
29131 RLCA
29132 AND 7 Keep only bits 0-2
29134 ADD A,160 Now A=64, 32, 16, 8, 4, 2, or 1, with the set bit corresponding to the disguise that Sam was wearing
29136 LD D,A
29137 LD E,21
29139 LD A,(DE)
29140 LD DE,32744 32744 holds the disguise status flags
29143 EX DE,HL Set the appropriate bit at 32744, making the disguise known to the police
29144 OR (HL)
29145 LD (HL),A
29146 JP 32009 Set the attribute bytes for Sam's current disguise in the bottom right corner of the screen
Prev: 29088 Up: Map Next: 29149