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Used by the routines at DEC_TO_FP and INT_TO_FP.
This subroutine simply returns if the current value held in the A register does not represent a digit but if it does then the floating-point form for the digit becomes the 'last value' on the calculator stack.
A Character code
F Carry flag reset if the character is a digit (0-9)
STK_DIGIT 11554 CALL NUMERIC Is the character a digit?
11557 RET C Return if not.
11558 SUB "0" Replace the code by the actual digit.
This routine continues into STACK_A.
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