Routines 
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Used by the routine at compare.
The address of this routine is found in the table of addresses. It is called via the calculator literal 55 by the routines at NEXT_LOOP, PRINT_FP, ln, get_argt and to_power.
This subroutine returns a 'last value' of one if the present 'last value' is greater than zero and zero otherwise. It is also used by other subroutines to 'jump on plus'.


greater_0  13561  CALL TEST_ZERO  Is the 'lastvalue' zero?  
13564  RET C  If so, return.  
13565  LD A,255  Jump forward to less_0 but signal the opposite action is needed.  
13567  JR SIGN_TO_C 
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