Technical Information
Namco System 1 hardware
Game ID : BK
Main CPU : 6809 (@ 1.536 Mhz)
Sub CPU : 6809 (@ 1.536 Mhz)
Sound CPU : 6809 (@ 1.536 Mhz)
MCU : HD63701 (@ 1.536 Mhz)
Sound Chips : YM2151 (@ 3.57958 Mhz), Namco advanced 8-channel stereo WSG, stereo DAC
Screen orientation : Horizontal
Video resolution : 288 x 224 pixels
Screen refresh : 60.61 Hz
Palette colors : 24-bit RGB palette
Players : 2
Control : 8-way joystick
Buttons : 1
(info found at http://www.arcade-history.com)