ACK_INTR
outw(ACK_INTR | 0xff, BASE + VX_COMMAND);
outw(ACK_INTR | cst, BASE + VX_COMMAND);
# define C_INTR_LATCH (unsigned short) (ACK_INTR|0x1)
# define C_CARD_FAILURE (unsigned short) (ACK_INTR|0x2)
# define C_TX_COMPLETE (unsigned short) (ACK_INTR|0x4)
# define C_TX_AVAIL (unsigned short) (ACK_INTR|0x8)
# define C_RX_COMPLETE (unsigned short) (ACK_INTR|0x10)
# define C_RX_EARLY (unsigned short) (ACK_INTR|0x20)
# define C_INT_RQD (unsigned short) (ACK_INTR|0x40)
# define C_UPD_STATS (unsigned short) (ACK_INTR|0x80)