PORTIBM PC Portable (uses same BIOS as XT) 1040 - Wang PCIBM PC - SCREEN 4 CONFIGURATION PORTIBM PC Portable (uses same BIOS as XT)
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 1010h,PORTIBM PC Portable (uses same BIOS as XT) 1020h,PORTIBM PC Portable (uses same BIOS as XT) 1030h,MEM F000h:0000h"Wang"

1040  ?W  write 01h to map screen buffer 4 into memory at F000h:0000h
	  write 00h to unmap the screen buffer