Raspberry Pi 3

Old setup: HDMI to VGA to GBS8100 connected to K4901

PROS:
Pretty much plug and play after you make the connector to the monitor

CONS:
Requires 5v connection
Image Resolution not low enough for clear images(makes image look blurry and washed out)
Only fills screen when adjusting with onboard controls (and settings do not save when turned off)

New Setup: HDMI to VGA to VGA BREAKOUT CABLE connected to K4901

PROS:
NATIVE 240p/480p @ 15kHz - No washed out colors, crispy image on screen

CONS:
Making your own cable can be a task if not technical inclined.
(Ultimarc sells a cable for $17)
https://www.ultimarc.com/arcade-vga-a...

Pinout
Pin 1 - Red
Pin 2 - Green
Pin 3 - Blue
Pins 5,6,7,8,9,10 - Ground, only one is needed, they should be all connected
Pin 13 - H-Sync
Pin 14 - V-Sync

VGA Breakout cable pinout image source:
http://92.49.www.savethesoup.de/vga-c...

Need to customize raspberry Pi config per your monitor
(i used a Well Gardner 19K4901)

settings in config.txt:

disable_splash=1
display_rotate=2
disable_overscan=1
overscan_scale=1
overscan_left=35
overscan_right=60
hdmi_ignore_edid=0xa5000080
hdmi_force_hotplug=1
hdmi_drive=2
config_hdmi_boost=11
hdmi_pixel_encoding=2
hdmi_group=1
hdmi_mode=6

If you already have a controller interface and a sound amplifier, this is the BEST method, and it only costs you the price of an old VGA cable or a breakout cable from Ultimarc!

ALT:
JPAC - JPAC is a jamma adaptor accepts VGA input, controller input, sound amp, wires directly into Jamma harness
https://www.ultimarc.com/control-inte...

RaspberryJamma - Awesome product. I purchased one last year and it was the reason why I wanted to get away from the GBS-8100.
A bit pricy but worth it for a true out of box solution.
https://highscoresave.com/cat/index/s...