Routines 
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The address of this routine is found in the table of addresses. It is called via the calculator literal +36 by the routines at NEXT_LOOP, PRINT_FP, int, get_argt and atn.
This subroutine returns a 'last value' of one if the present 'last value' is less than zero and zero otherwise. It is also used by other subroutines to 'jump on minus'.


less_0  3506  XOR A  Clear the A register.  
This entry point is used by the routine at greater_0 with A=+FF.


SIGN_TO_C  3507  INC HL  Point to the sign byte.  
3508  XOR (HL)  The carry is reset for a positive number and set for a negative number; when entered from greater_0 the opposite sign goes to the carry.  
3509  DEC HL  
350A  RLCA  
This routine continues into FP_0_1.

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