Int 6F Fn 24  - Hp Vectra Ex-bios - "f_cmos_ret" - Write Cmos Memory       [b]

   AH = 24h
   BP = 0012h (driver ID of V_SYSTEM)
   BL = address of CMOS byte to write
   AL = new value

Return: AH = status (see #3415)
   BP,DS destroyed

Note:  updates the CMOS checksum fields (both IBM-standard and HP checksums)

See Also: AH=00h"HP Vectra",AH=22h/BP=0012h