Routines
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720A: Control the bike when ERIC's not sitting on the saddle
 The address of this uninterruptible subcommand routine is placed into bytes 0x11 and 0x12 of the bike's buffer by the routine at 725E. It controls the bike when it is wheeling along on its own (after ERIC has dismounted), or when ERIC is standing on the saddle. 720A LD HL,\$7FF0 7FF0 holds the bike's momentum 720D LD A,(HL) Pick this up in A 720E SUB \$07 Is it time for the bike to come to rest? 7210 JR NC,\$7227 Jump if not It's time for the bike to come to rest. 7212 LD L,\$ED HL=7FED (ERIC's status flags) 7214 BIT 7,(HL) Is ERIC standing on the saddle of the bike? 7216 JR Z,\$721A Jump if not 7218 LD (HL),\$10 Set bit 4 at 7FED: ERIC is falling and will not land on his feet 721A LD H,\$D3 0xD3=bike 721C CALL \$61B4 Update the SRB for the bike's current animatory state and location 721F DEC A A=animatory state of the bike resting on the floor 7220 LD L,\$12 Remove the address of this routine from bytes 0x11 and 0x12 of the bike's buffer 7222 LD (HL),\$00 7224 JP \$6130 Update the bike's animatory state and update the SRB The bike still has some momentum left. Check whether it has hit anything. 7227 LD (HL),A Set the bike's remaining momentum at 7FF0 7228 LD HL,(\$D300) E=bike's x-coordinate, A=bike's animatory state 722B LD A,L 722C LD E,H 722D CALL \$7000 Check for walls, closed doors or ALBERT in the bike's path 7230 LD L,\$ED HL=7FED (ERIC's status flags) 7232 JR NC,\$723A Jump if ALBERT's not impeding the bike's progress 7234 BIT 7,(HL) Is ERIC standing on the saddle of the bike? 7236 JR Z,\$7244 Jump if not 7238 LD (HL),\$10 Set bit 4: ERIC is falling and will not land on his feet 723A JR NZ,\$7244 Jump if there are no walls or closed doors in the bike's path 723C BIT 7,(HL) Is ERIC standing on the saddle of the bike? 723E JR Z,\$721A Jump if not 7240 LD (HL),\$40 Set bit 6: ERIC has hit a wall or closed door while standing on the saddle of the bike 7242 JR \$721A 7244 LD H,\$D3 0xD3=bike 7246 CALL \$7250 Move the bike and one space forward and update the SRB 7249 LD A,(\$7FED) 7FED holds ERIC's status flags 724C RLCA Is ERIC standing on the saddle of the bike? 724D RET NC Return if not This entry point is used by the routine at 725E. 724E LD H,\$D2 0xD2=ERIC This entry point is used by the routine at 76AC. 7250 CALL \$61B4 Update the SRB for the character's current animatory state and location 7253 RLCA 7254 RRCA 7255 JR C,\$7259 Jump if the character is facing right 7257 DEC E 7258 DEC E 7259 INC E Now E=x-coordinate of the spot in front of the character 725A JP \$7BEB Update the character's location, update the SRB, and scroll the screen if necessary
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