Routines 
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23843  LD A,(53761)  A=ERIC's xcoordinate  
23846  SUB 128  Did ERIC hit the closed skool gate?  
23848  CP 16  
23850  SBC A,A  A=255 if so, 0 otherwise  
23851  ADD A,254  L=253 if ERIC hit the skool gate, 254 otherwise  
23853  LD L,A  
This entry point is used by the routine at 23859 with L=255.


23854  LD H,159  Now HL points at the appropriate descent table  
23856  JP 64501  Begin the descent 
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