STATUS_BUSY
#define STATUS_BUSY 0x00080000
#define STATUS_BUSY BIT(31)
#define STATUS_BUSY 0x40000000
#define STATUS_BUSY (PEND_WR_TIME | PEND_WR_DATE)
#define STATUS_BUSY BIT(0)
#define STATUS_BUSY 0x10 /* FDC busy */
#define STATUS_BUSY BIT(9)