ADVV_SCSIBUSY_B
scsi_busy = adv_read_lram_8(adv, ADVV_SCSIBUSY_B);
adv_write_lram_8(adv, ADVV_SCSIBUSY_B, scsi_busy);
scsi_busy = adv_read_lram_8(adv, ADVV_SCSIBUSY_B);
adv_write_lram_8(adv, ADVV_SCSIBUSY_B, scsi_busy);
adv_write_lram_8(adv, ADVV_SCSIBUSY_B, 0);