03C0-03CF ---- EGA  (1st Enhanced Graphics Adapter)    alternate at 02C0


03C0   (r)/w   EGA VGA ATC index/data register
03C1   r   VGA other attribute register
03C2   r   EGA VGA input status 0 register
   w   VGA miscellaneous output register
03C3   r/w VGA video subsystem enable
03C4   w   EGA TS index register
   r/w VGA sequencer index register
03C5   w   EGA TS data register
   r/w VGA other sequencer register
03C6   r/w VGA PEL mask register
03C7   r/w VGA PEL address read mode
   r   VGA DAC state register
03C8   r/w VGA PEL address write mode
03C9   r/w VGA PEL data register
03CA   w   EGA graphics 2 position register
   r   VGA feature control register
03CC   w   EGA graphics 1 position register
   r   VGA miscellaneous output register
03CE   w   EGA GDC index register
   r/w VGA graphics address register
03CF   w   EGA GDC data register
   r/w VGA other graphics register