#define S_IO BIT(1) /* Input/Output line from SCSI bus */
#define S_CD BIT(2) /* Command/Data line from SCSI bus */
#define S_BUSY BIT(3) /* Busy line from SCSI bus */
-#define S_ACK BIT(4) /* Acknowlege line from SCSI bus */
+#define S_ACK BIT(4) /* Acknowledge line from SCSI bus */
#define S_REQUEST BIT(5) /* Request line from SCSI bus */
#define S_SELECT BIT(6) /* */
#define S_ATN BIT(7) /* */