INT 10 - EGA Register Interface Library - WRITE REGISTER RANGE
        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
SeeAlso: AH=F1h,AH=F2h