CMD_INTR
CONTROL = (BASE_CMD & ~CMD_INTR) | CMD_START_ARB;
(BASE_CMD & ~CMD_INTR) | CMD_DRVR_ENABLE | CMD_SEL;
(BASE_CMD & ~CMD_INTR) | CMD_DRVR_ENABLE | CMD_SEL | CMD_ATTN;
CONTROL = (BASE_CMD & ~CMD_INTR) | CMD_DRVR_ENABLE;
CONTROL = (BASE_CMD & ~CMD_INTR) | CMD_DRVR_ENABLE | CMD_ATTN;
#define BASE_CMD (CMD_INTR | CMD_EN_PARITY)