Вроде так:
 
Public Const DM_BITSPERPEL = &H40000
 
Public Const DM_PELSWIDTH = &H80000
 
Public Const DM_PELSHEIGHT = &H100000
 
Public Const CCHDEVICENAME = 32
 
Public Const CCHFORMNAME = 32
 
Type DEVMODE
 
dmDeviceName As String * CCHDEVICENAME
 
dmSpecVersion As Integer
 
dmDriverVersion As Integer
 
dmSize As Integer
 
dmDriverExtra As Integer
 
dmFields As Long
 
dmOrientation As Integer
 
dmPaperSize As Integer
 
dmPaperLength As Integer
 
dmPaperWidth As Integer
 
dmScale As Integer
 
dmCopies As Integer
 
dmDefaultSource As Integer
 
dmPrintQuality As Integer
 
dmColor As Integer
 
dmDuplex As Integer
 
dmYResolution As Integer
 
dmTTOption As Integer
 
dmCollate As Integer
 
dmFormName As String * CCHFORMNAME
 
dmUnusedPadding As Integer
 
dmBitsPerPel As Integer
 
dmPelsWidth As Long
 
dmPelsHeight As Long
 
dmDisplayFlags As Long
 
dmDisplayFrequency As Long
 
End Type
 
 
 
Declare Function ChangeDisplaySettings Lib "user32.dll" Alias "ChangeDisplaySettingsA" (lpDevMode As DEVMODE, 
 
ByVal dwFalgs As Long) As Long
 
 
Public Sub SetVideoMode(Width As Long, height As Long, Depth As Long)
 
     im dm As DEVMODE
 
    dm.dmPelsWidth = Width
 
    dm.dmPelsHeight = height
 
    dm.dmBitsPerPel = Depth
 
    dm.dmSize = Len(dm)
 
    dm.dmFields = DM_PELSWIDTH + DM_PELSHEIGHT + DM_BITSPERPEL
 
    ChangeDisplaySettings dm, 0
 
End Sub
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