Sega NAOMI Multiboard- F355 Challenge

[bravesirchris]

Hello all, I need some advice on a Naomi multiboard. I've got a twin and one side has a graphic Err on. dose any one know which of the Naomi board dose the video graphics?

any advice would be great

 

[AMS]

Both run the video as it’s doubling the power . You can take out both boards put in a normal Naomi bios and see what is giving you the error and swap that pcb for a new version. Must be old revision if its the master or if its the slave it can be newer