Mario Bros japan bootleg on Ambush hardware 

This romset (japanese version) comes from a faulty bootleg pcb.Game differences are none.
Note:it runs on a modified (extended) Tecfri's Ambush hardware.
Main cpu Z80
Sound ic AY-3-8910 x2 -instead of AY-3-8912 x2 of Ambush
Work ram 4Kb (6116 x2) -double of Ambush
OSC: 18,432 Mhz
Rom definition:
mbjba-6, mbjba-7, mbjba-8 main program
mbjba-1 to mbjba-5 gfx (chars,sprites)
Eproms are 2732,2764,27128

Dumped by tirino73 >isolani1973@libero.it<