)
Values for group index:
 Pointer/data chips
 00h	CRT Controller (25 reg) 3B4h mono modes, 3D4h color modes
 08h	Sequencer (5 registers) 3C4h
 10h	Graphics Controller (9 registers) 3CEh
 18h	Attribute Controller (20 registers) 3C0h
 Single registers
 20h	Miscellaneous Output register 3C2h
 28h	Feature Control register (3BAh mono modes, 3DAh color modes)
 30h	Graphics 1 Position register 3CCh
 38h	Graphics 2 Position register 3CAh