No multiply instructions are available in the original Z80. Different sizes and variants of additions, shifts, and rotates have somewhat differing effects on flags because most of the flag-changing properties of the 8080 were copied. However, the parity flag bit P of the 8080 (bit 2) is called P/V (parity/overflow) in the Z80 as it serves the additional purpose of a twos complement overflow indicator, a feature lacking in the 8080. Arithmetic instructions on the Z80 set it to indicate overflow rather than parity, while bitwise instructions still use it as a parity flag. This new overflow flag is used for all new Z80-specific 16-bit operations (, ) as well as for 8-bit arithmetic operations, although the 16-bit operations inherited from the 8080 (, , ) do not affect it. Also, bit 1 of the flags register (a spare bit on the 8080) is used as a flag, N, that indicates whether the last arithmetic instruction executed was a subtraction or addition. The Z80 version of the instruction (Decimal Adjust Accumulator for BCD arithmetic) checks the N flag and behaves accordingly, so a (hypothetical) subtraction followed later by will yield a different result on an old 8080 than on the Z80. However, this would likely be erroneous code on the 8080, as was defined for addition only on that processor.