HAL 21 © 1985 SNK.
A vertically scrolling shoot 'em up from SNK.
Main CPU : (2x) Zilog Z80 (@ 4 Mhz)
Sound CPU : Zilog Z80 (@ 4 Mhz)
Sound Chips : (2x) General Instrument AY8910 (@ 1.5 Mhz)
Players : 2
Control : 8-way joystick
Buttons : 2
Released in March 1985 in Japan.