PORTIBM PC Portable (uses same BIOS as XT) 0530-0533 - Gravis Ultra Sound Daughter Card by Advanced Gravis
Range:	dipswitch selectable from PORTIBM PC Portable (uses same BIOS as XT) 0530h-0533h, PORTIBM PC Portable (uses same BIOS as XT) 0604h-0607h,
	  PORTIBM PC Portable (uses same BIOS as XT) 0E80h-0E83h, and PORTIBM PC Portable (uses same BIOS as XT) 0F40h-0F43h
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0530h"Windows Sound System"

0530  RW  address select (see #P0895)
0531  RW  data (selected by PORTIBM PC Portable (uses same BIOS as XT) 0530h)
0532  RW  status
0533  RW  PIO data