Here I send the XF86Config for that card with 4 Mb VRAM
XF68Config. It is for XFree86-312F
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# XF86Config auto-generated by XF86Setup
# See 'man XF86Config' for info on the format of this file
Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "tcp/localhost:7100"
EndSection
Section "ServerFlags"
EndSection
Section "Keyboard"
Protocol "Standard"
AutoRepeat 500 5
LeftAlt Meta
RightAlt Meta
ScrollLock Compose
RightCtl Control
XkbKeycodes "xfree86"
XkbTypes "default"
XkbCompat "default"
XkbSymbols "us(pc101)"
XkbGeometry "pc"
XkbKeymap "xfree86(es)"
XkbRules "xfree86"
XkbModel "pc101"
XkbLayout "es"
EndSection
Section "Pointer"
Protocol "MouseSystems"
Device "/dev/gpmdata"
BaudRate 1200
Emulate3Timeout 50
SampleRate 0
EndSection
Section "Monitor"
Identifier "My Monitor"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 31-65
VertRefresh 50-100
Modeline "1024x768" 85.00 1024 1072 1192 1368 768 772 775 795
Modeline "800x600" 50.00 800 856 976 1040 600 637 643 666 +hsync +vsync
Modeline "640x480" 31.50 640 680 720 864 480 488 491 521
EndSection
Section "Device"
Identifier "Diamond Stealth64 Video 3240/3400"
VendorName "Unknown"
BoardName "Unknown"
Option "power_saver"
DacSpeed 220000
VideoRam 4096
EndSection
Section "Device"
Identifier "Generic VGA"
VendorName "Unknown"
BoardName "Unknown"
Chipset "generic"
EndSection
Section "Screen"
Driver "Accel"
Device "Diamond Stealth64 Video 3240/3400"
Monitor "My Monitor"
BlankTime 0
SuspendTime 15
OffTime 30
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 32
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
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Hope this helps
MGM