Spelunker II - 23 no Kagi

Irem M-62 system hardware

Main CPU : Zilog Z80 (@ 4 Mhz)
Sound CPU : Motorola M6803 (@ 894.886 Khz)
Sound Chips : (2x) General Instrument AY8910 (@ 894.886 Khz), (2x) MSM5205 (@ 384 Khz)

Screen orientation : Horizontal
Video resolution : 384 x 256 pixels
Screen refresh : 55.00 Hz
Palette colors : 768

Players : 2
Control : 8-way joystick
Buttons : 2

Released in October 1986 by Irem, under license from Broderbund.

The subtitle of this game translates from Japanese as '23 Keys'.