Carry Flag (CF) - this flag is set to 1 when there is an unsigned
overflow. For example when you add bytes 255+1 (result is not in
range 0...255). When there is no overflow this flag is set to 0.
· Zero Flag (ZF) - set to 1 when result is zero. For none zero result
this flag is set to 0.
· Sign Flag (SF) - set to 1 when result is negative. When result is
positive it is set to 0. Actually this flag take the value of the most
significant bit.
· Overflow Flag (OF) - set to 1 when there is a signed overflow.
For example, when you add bytes 100 + 50 (result is not in range -
128...127).
· Parity Flag (PF) - this flag is set to 1 when there is even number
of one bits in result, and to 0 when there is odd number of one bits.
Even if result is a word only 8 low bits are analyzed!
· Auxiliary Flag (AF) - set to 1 when there is an unsigned
overflow for low nibble (4 bits).
· Interrupt enable Flag (IF) - when this flag is set to 1 CPU reacts
to interrupts from external devices.
· Direction Flag (DF) - this flag is used by some instructions to
process data chains, when this flag is set to 0 - the processing is
done forward, when this flag is set to 1 the processing is done
backward.