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351B: THE 'OR' OPERATION (offset +07)
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 OR Y' and returns X if Y is zero and the value 1 otherwise.
Input
DE Address of the first byte of the second number (Y)
HL Address of the first byte of the first number (X)
Output
no_or_no 351B EX DE,HL Point HL at Y, the second number.
351C CALL TEST_ZERO Test whether Y is zero.
351F EX DE,HL Restore the pointers.
3520 RET C Return if Y was zero; X is now the 'last value'.
3521 SCF Set the carry flag and jump back to set the 'last value' to 1.
3522 JR FP_0_1
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