Bingo game?

Etched in copper on top of board	REV B

ROM text/graphics showed bingo stuff

Empty 40 pin socket @ U1 and U4

D4016
mostek TC???? zero power
16.000 crystal

Mame 0.141.2

E:\hardware\EETools\roms>e:\games\mame\mameui32\mameui32 -romident e:\hardware\eetools\roms\revb\roms\revb.u21 
revb.u21            NO MATCH

E:\hardware\EETools\roms>e:\games\mame\mameui32\mameui32 -romident e:\hardware\eetools\roms\revb\roms\revb.u22 
revb.u22            NO MATCH

E:\hardware\EETools\roms>e:\games\mame\mameui32\mameui32 -romident e:\hardware\eetools\roms\revb\roms\revb.u23 
revb.u23            NO MATCH

E:\hardware\EETools\roms>e:\games\mame\mameui32\mameui32 -romident e:\hardware\eetools\roms\revb\roms\revb.u2 
revb.u2             NO MATCH