anecdotally the Crypt Killer pcb I just restored had a secondary PCB for projection cabinets. Took the JAMMA RGBS signal and combined it to composite out. Has one random chip on the pcb.
Not sure if it's essential but at least Konami had a bit of additional hardware involved when it came to CRT vs Projection
Not sure if it's essential but at least Konami had a bit of additional hardware involved when it came to CRT vs Projection