Routines 
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This subroutine loads two floating point numbers into the BC register pair. It is thus used to pick up parameters in the range +00 to +FF. It also obtains in DE the 'diagonal move' values (+/1,+/1) which are used in DRAW_LINE.


STK_TO_BC  2307  CALL STK_TO_A  First number to A.  
230A  LD B,A  Hence to B.  
230B  PUSH BC  Save it briefly.  
230C  CALL STK_TO_A  Second number to A.  
230F  LD E,C  Its sign indicator to E.  
2310  POP BC  Restore first number.  
2311  LD D,C  Its sign indicator to D.  
2312  LD C,A  Second number to C.  
2313  RET  BC, DE are now as required. 
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