history:
-------------------------------
1.08a
  (1) disable driver when on-board IDE is disable and try to install IDE driver
  (2) add code "try to" avoid ACAD R11 bug
1.08b
  (1) reclean GS-CDROM problem with maxtor HD
1.08c
  (1) unlock the limit due to version before 5513 A4
1.08d
  (1) reclean Hitachi-CDROM problem with SCSI 2940,3940
  (2) clean error showing DMA message when HD unsupport DMA mode
  (3) reclean GS-cdrom with ACAD problem
1.08e
  (1) reclean Hitachi-CDROM problem in DMA mode
  (2) disable driver when boot with SCSI and try to install IDE driver
1.08f
  (1) down the speed of Maxtor 71260 AT DMA mode to 240 ns cycle time
  (2) make workaround when mode 4 Quantan with CDROM in the same channel
  (3) let quantum run dma
1.09a
  (1) down the speed of Quantun mode 4 when attach running in PIO mode with
      CDROM in the same channel
1.09b
  (1) add master mode error recover routing