What search terms have you tried already to find websites with guides to making a portable N64? How much work have you done already?<p>N64 games, &quot;roms&quot;, are very easy to find on the Internet. Watch out for sites that also distribute malware. Once you have the roms you want a &quot;N64 backup unit&quot;.  These are going to be hard to find. I don&#x27;t know of anyone providing plans for a DIY backup unit.