Routines 
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28576  CALL 28240  Check whether ERIC is on a staircase  
28579  LD L,0  Point HL at byte 0 of ERIC's buffer  
28581  JR C,28650  Jump if ERIC's on a staircase  
28583  BIT 7,(HL)  Check the 'direction' bit of ERIC's animatory state  
28585  LD A,D  A=ERIC's ycoordinate  
28586  JR Z,28625  Jump if ERIC is facing left  
28588  CP 3  Is ERIC on the top floor?  
28590  JR Z,28616  Jump if so  
28592  CP 10  Is ERIC on the middle floor?  
28594  JR Z,28611  Jump if so  
28596  CP 14  Is ERIC on the assembly hall stage?  
28598  JP NZ,28449  Move ERIC one space to the right if not  
28601  LD A,E  A=ERIC's xcoordinate  
28602  CP 80  This is the xcoordinate of the top of the stairs leading from the stage to the bottom floor  
28604  JR NZ,28598  Jump if ERIC is not here  
This entry point is used by the routines at 28315, 28436 and 28460.


28606  LD B,D  B=ERIC's postmidstride ycoordinate (down a stair)  
28607  INC B  
28608  JP 28516  Move ERIC one space right or left too  
ERIC is on the middle floor, facing right.


28611  LD A,E  A=ERIC's xcoordinate  
28612  CP 15  This is the xcoordinate of the top of the stairs leading down to the bottom floor at the far left of the boy's skool  
28614  JR 28604  Move ERIC down a stair if he's here  
ERIC is on the top floor, facing right.


28616  LD A,E  A=ERIC's xcoordinate  
28617  CP 84  This is the xcoordinate of the top of the stairs just outside the head's study  
28619  JR Z,28606  Move ERIC down a stair if he's here  
28621  CP 179  This is the xcoordinate of the top of the stairs leading down to the middle floor in the girls' skool  
28623  JR 28604  Move ERIC down a stair if he's here  
ERIC is facing left.


28625  CP 10  Is ERIC on the middle floor?  
28627  JR Z,28641  Jump if so  
28629  CP 3  Is ERIC on the top floor?  
28631  JP NZ,28473  Move ERIC one space left if not  
28634  LD A,E  A=ERIC's xcoordinate  
28635  CP 26  This is the xcoordinate of the top of the stairs leading down from the Revision Library  
28637  JR NZ,28631  Move ERIC one space left if he's not here  
28639  JR 28606  Otherwise move him down a stair  
ERIC is on the middle floor, facing left.


28641  LD A,E  A=ERIC's xcoordinate  
28642  CP 85  This is the xcoordinate of the top of the stairs leading down to the stage  
28644  JR Z,28606  Move ERIC down a stair if he's here  
28646  CP 183  This is the xcoordinate of the top of the stairs leading down to the bottom floor in the girls' skool  
28648  JR 28637  Move ERIC down a stair if he's here  
ERIC is on a staircase.


28650  XOR (HL)  Reset the carry flag if ERIC is facing the wrong way to descend the stairs  
28651  RLA  
28652  JP NC,28216  Turn ERIC round if he's facing the wrong way  
28655  JR 28606  Otherwise move him down a stair 
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