I also build a SAP variant inspired by the Ben Eater series on YouTube. You can check it out here:
<a href="https://github.com/dangrie158/SAP-1" rel="nofollow">https://github.com/dangrie158/SAP-1</a>
Interestingly my docs are very similar to the linked article:
<a href="https://dangrie158.github.io/SAP-1/" rel="nofollow">https://dangrie158.github.io/SAP-1/</a><p>I think building such a low-level computer made me appreciate and understand current technology much more