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34F9: THE 'GREATER THAN ZERO' OPERATION (offset +37)
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 +37 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'.
Input
HL Address of the first byte of the number
Output
greater_0 34F9 CALL TEST_ZERO Is the 'last-value' zero?
34FC RET C If so, return.
34FD LD A,$FF Jump forward to less_0 but signal the opposite action is needed.
34FF JR SIGN_TO_C
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