IO_MDA
IO_VGA : IO_MDA;
{ 0, KD_MONO, "mda", 0, 0, 0, IO_MDA, IO_MDASIZE, MONO_CRTC,
{ 0, KD_EGA, "ega", 0, 0, 0, IO_MDA, 48, MONO_CRTC,
{ 0, KD_EGA, "ega", 0, 0, V_ADP_COLOR, IO_MDA, 48, COLOR_CRTC,
{ 0, KD_EGA, "ega", 0, 0, V_ADP_COLOR, IO_MDA, 48, COLOR_CRTC,
#define MONO_CRTC (IO_MDA + 0x04) /* crt controller base mono */