Int 6F Fn 20  - Hp Vectra Ex-bios - "f_ram_ret" - Reserve Ex-bios Memory   [b]

   AH = 20h
   BP = 0012h (driver ID for V_SYSTEM)
   BX = new value for "last-used DS"
   DX = new value for "maximum DS"

Return: AH = status (00h) (see #3415 at INT 6F/AH=00h"HP Vectra")
   BP,DS destroyed

Note:  the F_INS_FIXGETDS and F_INS_FREEGETDS functions
     (see AH=0Eh/BP=0012h,AH=14h/BP=0012h) also modify the values returned
     by this call, requiring care if both methods are used to allocate
     memory

See Also: AH=00h"HP Vectra",AH=0Eh/BP=0012h,AH=14h/BP=0012h,AH=1Eh/BP=0012h