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The address of this routine is found in the table of addresses. It is called indirectly via fp_calc_2.
This subroutine performs the binary operation 'X$ AND Y' and returns X$ if Y is non-zero and a null string otherwise.
DE Address of the first byte of the number (Y)
str_no 13613 EX DE,HL Point HL at Y, DE at X$.
13614 CALL TEST_ZERO Test whether Y is zero.
13617 EX DE,HL Swap the pointers back.
13618 RET NC Return with X$ as the 'last value' if Y was non-zero.
13619 PUSH DE Save the pointer to the number.
13620 DEC DE Point to the fifth byte of the string parameters, i.e. length-high.
13621 XOR A Clear the A register.
13622 LD (DE),A Length-high is now set to zero.
13623 DEC DE Point to length-low.
13624 LD (DE),A Length-low is now set to zero.
13625 POP DE Restore the pointer.
13626 RET Return with the string parameters being the 'last value'.
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