Shift Arithmetic operand1 Left. The number of shifts is set by operand2.
Shift all bits left, the bit that goes off is set to CF.
Zero bit is inserted to the right-most position.
MOV AL, 0E0h ; AL = 11100000b
SAL AL, 1 ; AL = 11000000b, CF=1.
OF=0 if first operand keeps original sign.