A flag on the 8086 processor which indicates that a carry occured in an addition or subtraction operation.

Carry Flag (usually abbreviated as CF) is part of the Intel Flags Register (possibly of some other status registers).

This flag is set when there's a carry out/into the most significant bit in an operation. This indicates an unsigned number overflow. This flag should be taken into consideration when working with unsigned numbers.

Example (in assembly):

mov al, 10000000b
add al, 10000000b 
; CF=1 because there's a carry out of MSB


mov al, 00000000b
sub al, 10000000b 
; CF=1 because there's a carry into MSB

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