Routines
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7386: 'M' pressed - mount bike
The address of this routine is found in the table of keypress handling routines at E550. It is called from the main loop at F6EA when 'M' or 'B' is pressed.
Input
A ERIC's animatory state
D ERIC's y-coordinate
E ERIC's x-coordinate
7386 AND \$80 A=0x00 if ERIC's facing left, 0x80 if facing right
7388 ADD A,\$19 A=0x19/0x99: bike standing upright
738A LD B,A Copy the bike's animatory state to B
738B LD HL,\$D302 H=0xD3 (bike), L=0x02
738E LD A,D A=ERIC's y-coordinate
738F CP (HL) Is ERIC on the same floor as the bike?
7390 RET NZ Return if not
7391 DEC L L=0x01
7392 LD A,E A=ERIC's x-coordinate
7393 CP (HL) Is ERIC at the same x-coordinate as the bike?
7394 RET NZ Return if not
ERIC is standing beside the bike. Prepare to place him on the saddle.
7395 DEC L L=0x00
7396 LD (HL),B Fill in the animatory state of the bike
7397 CALL \$7154 Make a sound effect
739A LD HL,\$7FFB 7FFB holds ERIC's status flags
739D LD (HL),\$02 Set bit 1: examine the secondary status flags at 7FED
739F LD A,\$12
73A1 LD L,\$EE HL=7FEE (value from the keypress offset table corresponding to the last key pressed while riding the bike)
73A3 LD (HL),A Initialise this to 0x12 (which doesn't correspond to any key)
73A4 INC L Initialise the bike's speed counter (at 7FEF) to 0x12 (matching its initial momentum, set below, so that it doesn't move forward before ERIC has started pedalling)
73A5 LD (HL),A
73A6 INC L Initialise the bike's momentum (at 7FF0) to 0x12 (giving ERIC a decent chance to start pedalling before the bike falls over)
73A7 LD (HL),A
73A8 LD L,\$F3 HL=7FF3 (ERIC's main action timer)
73AA JP \$7330 Place ERIC on the bike
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