xorg.conf

# shakesoda's xorg.conf with modelines for 640x480 and 800x600 arcade monitors
# tested with a Makvision M2929D4G-TS (h freqs 30-40KHz, v freqs 47-90Hz)

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "ServerFlags"
    Option         "DontZap" "false"
    Option         "DontZoom" "true"
    Option         "DontVTSwitch" "true"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "void"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
#    Modeline       "800x600" 38.21 800 832 976 1008 600 612 618 631
#    Modeline       "640x480" 24.11 640 672 760 792 480 490 495 505
    #HorizSync   15.75    
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       30.0 - 40.0
    VertRefresh     60.0
    ModeLine       "640x480" 12.324 640 648 706 784 480 483 489 524 -hsync +vsync
    ModeLine       "800x600" 39.63 800 832 912 1024 600 602 608 644 -hsync +vsync
    Option         "UseEDID" "false"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "UseEDID" "false"
    SubSection     "Display"
        Depth       24
        Modes      "640x480" "800x600"
    EndSubSection
EndSection