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Flag
values change as part of execution of the
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instructions
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General
rules for 6 condition/status registers
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PF -
set if and only if (iff) lsbyte of result
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contains
an even number of 1s
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ZF -
zero flag - set iff result was zero
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SF -
sign flag - set equal to msbit of result
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AF -
auxiliary flag
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Used
by decimal arithmetic instruction
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Set
iff there has been a carry from (or borrow to) the
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low
nibble to (from) the high nibble
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CF -
carry flag
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For
unsigned arithmetic => overflow
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Set
iff carry out of (or borrow into) the msbit of the
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result
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Can
also be used in rotate instructions
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