; ID_VL.EQU
SC_INDEX = 03C4h
SC_RESET = 0
SC_CLOCK = 1
SC_MAPMASK = 2
SC_CHARMAP = 3
SC_MEMMODE = 4
CRTC_INDEX = 03D4h
CRTC_H_TOTAL = 0
CRTC_H_DISPEND = 1
CRTC_H_BLANK = 2
CRTC_H_ENDBLANK = 3
CRTC_H_RETRACE = 4
CRTC_H_ENDRETRACE = 5
CRTC_V_TOTAL = 6
CRTC_OVERFLOW = 7
CRTC_ROWSCAN = 8
CRTC_MAXSCANLINE = 9
CRTC_CURSORSTART = 10
CRTC_CURSOREND = 11
CRTC_STARTHIGH = 12
CRTC_STARTLOW = 13
CRTC_CURSORHIGH = 14
CRTC_CURSORLOW = 15
CRTC_V_RETRACE = 16
CRTC_V_ENDRETRACE = 17
CRTC_V_DISPEND = 18
CRTC_OFFSET = 19
CRTC_UNDERLINE = 20
CRTC_V_BLANK = 21
CRTC_V_ENDBLANK = 22
CRTC_MODE = 23
CRTC_LINECOMPARE = 24
GC_INDEX = 03CEh
GC_SETRESET = 0
GC_ENABLESETRESET = 1
GC_COLORCOMPARE = 2
GC_DATAROTATE = 3
GC_READMAP = 4
GC_MODE = 5
GC_MISCELLANEOUS = 6
GC_COLORDONTCARE = 7
GC_BITMASK = 8
ATR_INDEX = 03c0h
ATR_MODE = 16
ATR_OVERSCAN = 17
ATR_COLORPLANEENABLE = 18
ATR_PELPAN = 19
ATR_COLORSELECT = 20
STATUS_REGISTER_1 = 03dah