code: function ROL() {
  		var value = modRead(),
  			result = ( value << 1 ) & 0xfe;
  
  		result = write( result | flagC );
  		flagC = ( value & 0x80 ) && 1;
  		flagZ = +( result === 0 );
  		flagN = ( result & 0x80 ) && 1;
  	}
docs: Rotate left.
  Opcodes: 0x2a, 0x26, 0x36, 0x2e, 0x3e