Battle gear 4 taito video machine,system error 901

i need help,the trouble of this video games was error 901,due to cmos battery dead/0volts,i try to replace the cmos battery then it inetialized after that it wont load the game,written there in screen error 901.this is taito battle gear 4,anybody have idea about this trouble,i try to open the the bios/cmos set-up,but there is password written,any idea how to remove the password,also the sitting of this game,you can contact me in my e-mail bugsban_12@yahoo.com,
thank you,wish you well reply to all my fellow technician...
cris,,,