got this board

In Mame getbass is marked as GET BASS STD, while my pcb came from a DLX cab. 
Rom board 833-13317
834-13318 sticker is on rom board too.
On cage the follow sticker are present
BSS-4500-CVT2
833-13317 GAME BD BSS-CVT2
 
I/O board 837-13283 (GET BASS MEC CONT BD in manual)  171-7558c

epr20690.ic11 is controller board prg
cpu is kl5c80a16cf
this board have 4 switch (sw3 to sw6)
a reset switch
2 bank of 8 dip switch
SW1 all off
SW2 all off
lh52256cn-70 ram (super cap backup)
sega 315-5296
sega 315-5649 both seem I/O chip
gal16v8d (sega 315-6126)
32 Mhz xtal
93c45 eeprom