INT 10 - EGA Register Interface Library - READ REGISTER RANGE
        AH = F2h
        CH = starting register number
        CL = Number of registers (>1)
        DX = group index
             00h CRTC (3B4h mono modes, 3D4h color modes)
             08h Sequencer 3C4h
             10h Graphics Controller 3CEh
             18h Attribute Controller 3C0h
        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=F3h