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AX = 7503h
Return:
AX = 7575h if supported CX = 0001h if supported BH = display type (00h color, 03h monochrome) BL = display state 01h internal LCD display is active 02h external VGA display is active 03h both displays active / DeskStation display mode enabled (not possible on all machines)
Note: Used by VCHAD.EXE and supported by all Toshiba VGA laptops until about 1994 (string "TOSHIBA " at F000:E010h should be checked before call). No longer supported by T21xx series, use INT 10/AX=5F50h instead. INT 42 normally points to F000:F065h but may be redirected by QEMM386
See Also:
AX=7500h - AX=7504h - INT 10/AX=5F50h - INT 15/
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