Routines
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13604: THE 'NUMBER AND NUMBER' OPERATION (offset 8)
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 the value zero otherwise.
Input
DE Address of the first byte of the second number (Y)
HL Address of the first byte of the first number (X)
no_and_no 13604 EX DE,HL Point HL at Y, DE at X.
13605 CALL TEST_ZERO Test whether Y is zero.
13608 EX DE,HL Swap the pointers back.
13609 RET NC Return with X as the 'last value' if Y was non-zero.
13610 AND A Reset the carry flag and jump back to set the 'last value' to zero.
13611 JR FP_0_1
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