<story><title>Nibbler 4 Bit CPU (2013)</title><url>https://www.bigmessowires.com/nibbler/</url></story><parent_chain></parent_chain><comment><author>omgtehlion</author><text>A couple of years ago I have built a copy of this project with my son on a breadboard with real (made in &amp;#x27;80s and &amp;#x27;90s) 74-series chips.&lt;p&gt;It was a very fun experience. And we liked the project very much.&lt;p&gt;It has a very small and concise schematics which makes it very easy and clear how CPU really works.&lt;p&gt;P.S.: the original simulator is written in C++&amp;#x2F;CLI (a .net flavour of c++), so I decided to refresh the project (to c#, it was easier to translate than to port to native c++), and added a real 1602-display simulator which looks nicer and support a “graphic” mode. You can play with it here &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;github.com&amp;#x2F;omgtehlion&amp;#x2F;nibbler-sim&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;github.com&amp;#x2F;omgtehlion&amp;#x2F;nibbler-sim&lt;/a&gt;</text></comment>
<story><title>Nibbler 4 Bit CPU (2013)</title><url>https://www.bigmessowires.com/nibbler/</url></story><parent_chain></parent_chain><comment><author>userbinator</author><text>It&amp;#x27;s worth noting that 4-bit microcontrollers are still in widespread use in ultra-low cost high-volume applications, where they use mask ROM and are usually in the form of a COB mount. Remote controls, 4-function calculators, and &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Handheld_electronic_game&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Handheld_electronic_game&lt;/a&gt; are some examples of where they can be found.</text></comment>