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51DC: Guide a character onto the catwalk or off it
Used by the routine at 52A0. Makes a character walk in from the left to the middle of the screen (at which point his name may be changed), or from the middle of the screen and off to the right.
51DC LD B,$28 The character will walk 40 paces
51DF LD H,$D2 We use ERIC's buffer at page 0xD2 to control the character
51E1 CALL $61B4 Update the SRB for the character's current animatory state and location
51E4 INC A A=character's next animatory state
51E5 AND $FB
51E7 BIT 0,A Is the character midstride now?
51E9 JR NZ,$51EC Jump if so
51EB INC E Otherwise move forward a pace
51EC CALL $6130 Update the character's animatory state and location and update the SRB
51EF CALL $62A0 Update the display
51F2 CALL $53AB Make a walking sound effect
51F5 LD C,$64 Wait a bit
51F7 DJNZ $51F7
51F9 DEC C
51FA JR NZ,$51F7
51FD DJNZ $51DE Jump back until all 40 paces have been walked
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