ZX Spectrum (ZXS) Sinclair
ＺＸアムストラッド （ＺＸＳ） シンクレア
There are no Gradius related games available for this region
(Japan).
System Information
Translation: ZX Spectrum
A very popular if average UK manufactured computer. I was a C64 man myself so I have not played many games on this system but people seem to hold it in high regard.