He was in a Nintendo Direct interview with some old-timer Japanese guy where they discussed how those games were made and his involvement, IIRC. Don't recall when this video was posted, sadly... It was a good one, very informative, it felt like a little bit like those Yorkshiremen from Monty Python, except it was all true stuff about how primitive the process of building Game&Watch games was.As far as I know he was never into hardware design.