The article mentions a &quot;6502.7&quot; CPU core that Ricoh had. I don&#x27;t think I&#x27;ve ever heard of this designation before, and Google doesn&#x27;t seem to find any relevant hits other than this article. Does anyone know something about it? I guess it&#x27;s probably just an internal designation for a specific layout variation&#x2F;revision, but it seems like it might be a new detail.