There&#x27;s kind of two ways of going about this, right?<p>One is to think of it as &quot;I have a functioning N64, how to I hack it into a handheld solution?&quot;.<p>This is a little rough, because it&#x27;ll be hard fitting the guts of a system into a handheld controller (see <a href="https:&#x2F;&#x2F;www.ifixit.com&#x2F;Device&#x2F;Nintendo_64" rel="nofollow">https:&#x2F;&#x2F;www.ifixit.com&#x2F;Device&#x2F;Nintendo_64</a>).<p>If you <i>were</i> to go this route, you&#x27;re also going to have to figure out how to replace the power supply with a battery (probably some pile of lithium-polymer batteries and maybe some converters), and also some kind of display to pretend to be a TV (something like <a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;LCD-Display-Composite-input-Raspberry&#x2F;dp&#x2F;B00ETOCRSG" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;LCD-Display-Composite-input-Raspberry&#x2F;...</a> ).<p>The other is &quot;How do I run N64 ROMs in a handheld solution?&quot;<p>In this case, look at an emulator (say, <a href="https:&#x2F;&#x2F;www.raspberrypi.org&#x2F;forums&#x2F;viewtopic.php?t=6761&amp;p=402363" rel="nofollow">https:&#x2F;&#x2F;www.raspberrypi.org&#x2F;forums&#x2F;viewtopic.php?t=6761&amp;p=40...</a>) and then build the hardware around it. However, you have a bit more flexibility in terms of what you can pull off. You&#x27;ll still have to solve the display problem though.