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    The FLAGS register is that the status register in Intel x86 microprocessors that contains the current state of the processor. This register is sixteen bits wide. Its successors, the EFLAGS and RFLAGS registers, are 32 bits and 64bits wide, severally. The broader registers retain compatibility with their smaller predecessors.

    The fixed bits at bit positions one, 3 and 5, and carry, parity, adjust, zero and sign flags are transmissible from a good earlier design, 8080 and 8085. The adjust flag used to be known as auxiliary carry bit in 8080 and half-carry bit within the Zilog Z80 design.

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