STC
Usage: STC Modifies flags: CF
Sets the Carry Flag to 1.
Set Flags
STC ; F9 [8086]
STD ; FD [8086]
STI ; FB [8086]
These instructions set various flags. STC sets the carry flag; STD sets the direction flag; and STI sets the interrupt flag (thus enabling interrupts).
To clear the carry, direction, or interrupt flags, use the CLC, CLD and CLI instructions. To invert the carry flag, use CMC.
Example:
stc