Int 10 Fn F3  - EGA Register Interface Library - Write Register Range      [V]

   AH = F3h
   CH = starting register
   CL = number of registers (>1)
   DX = group index (see AH=F2h)
   ES:BX -> buffer, CL bytes

Note:  the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
     compatibility box, and others

See Also: AX=7F05h,AH=F1h,AH=F2h