#define ACK_BUSY_X 0x4
#define ACK_BUSY_A 0x5
#define ACK_BUSY_B 0x6
+#define ACK_TARDY 0xb
+#define ACK_CONFLICT_ERROR 0xc
#define ACK_DATA_ERROR 0xd
#define ACK_TYPE_ERROR 0xe
+#define ACK_ADDRESS_ERROR 0xf
/* Non-standard "ACK codes" for internal use */
#define ACKX_NONE (-1)