Pi3 plus vga666 outputting 640x480 31k help

[JordanJ]

Hey guys

I'm running emulation station/retroarch (Colton downs vertical revision) and I'm trying to output through the gert vga666 in 640x480 in 31khz to an arcade monitor and I was just wondering which values would be required? I'll post my config shortly, but any help would be greatly appreciated

BTW disable SPI and IC2

heres my config

 # For more options and information see
 # http://rpf.io/configtxt
 # Some settings may impact device functionality. See link above for details

 # uncomment if you get no picture on HDMI for a default "safe" mode
 #hdmi_safe=1

 # uncomment this if your display has a black border of unused pixels visible
 # and your display can output without overscan
 disable_overscan=1

 # uncomment the following to adjust overscan. Use positive numbers if console
 # goes off screen, and negative if there is too much border
 #overscan_left=16
 #overscan_right=16
 #overscan_top=16
 #overscan_bottom=16

 # uncomment to force a console size. By default it will be display's size minus
 # overscan.
 #framebuffer_width=1280
 #framebuffer_height=720

 # uncomment if hdmi display is not detected and composite is being output
 #hdmi_force_hotplug=1

 # uncomment to force a specific HDMI mode (this will force VGA)
 #config_hdmi_boost=6
 #hdmi_ignore_edid=0xa5000080
 #hdmi_group=2
 #hdmi_mode=4

 #this was added to force vga note 640x480 60hz
 dtoverlay=vga666
 enable_dpi_lcd=1
 display_default_lcd=1

 dpi_group=2
 dpi_mode=4

 # uncomment to force a HDMI mode rather than DVI. This can make audio work in
 # DMT (computer monitor) modes
 #hdmi_drive=2

 # uncomment to increase signal to HDMI, if you have interference, blanking, or
 # no display
 #config_hdmi_boost=4

 # uncomment for composite PAL
 #sdtv_mode=2

 #uncomment to overclock the arm. 700 MHz is the default.
 #arm_freq=800

 # Uncomment some or all of these to enable the optional hardware interfaces
 dtparam=i2c_arm=off
 #dtparam=i2s=on
 dtparam=spi=off

 # Uncomment this to enable the lirc-rpi module
 #dtoverlay=lirc-rpi

 # Additional overlays and parameters are documented /boot/overlays/README

 # Enable audio (loads snd_bcm2835)
 dtparam=audio=on
 gpu_mem_256=128
 gpu_mem_512=256
 gpu_mem_1024=256
 overscan_scale=1

 # Pretends no audio formats are supported by HDMI display, forcing all sound out the 3.5mm headphone jack.
 # May not be needed for all HDMI devices
 #this was turned on to enable the 3.5 audio jack
 hdmi_ignore_edid_audio=1

[mitu]

You don't seem to run RetroPie, so why post here in the forums ? You can find the list of resolutions you can add in config.txt here.