Routines 
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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 nonzero and the value zero otherwise.


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 nonzero.  
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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