Thunder Blade/Hidden content
From NEC Retro
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On the title screen, press RUN to bring up the menu, then press HOLD ↙+Ⅰ SELECT .
Hold SELECT + RUN when powering on the system to display a colour test screen based on the SMPTE color bars, but with a set of greyscale shades at the bottom. Pressing Ⅰ will cycle through two additional test screens including a grid test and a greyscale bar screen. Press RUN on any of these test screens to exit and display the title screen.
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