Int 10 Fn CB01  - Unchain - Update Page 1 Offset                           [V]

   AX = CB01h
   BX = offset of page 1

Return: nothing
Desc:  inform UNCHAIN of the location of video page 1 in video memory; the
     default is 0000h

See Also: AX=CB02h,AX=CB03h,AX=CB04h,AX=CBFFh