Because they are both well-known and really well documented in a way that&#x27;s easy for beginners.

Noone ever mentions this one, but I always found it pretty cool: <a href="https:&#x2F;&#x2F;www.donnamaie.com&#x2F;AMD_2900.html" rel="nofollow">https:&#x2F;&#x2F;www.donnamaie.com&#x2F;AMD_2900.html</a>

i look forward to other resources as accessible to those pointed out. by all means, go for it.

But why is this always the first comment on custom CPU builds? Can&#x27;t there also be other designs out there?

it would be remiss to not mention the most excellent ben-eater&#x27;s 8bit-computer <a href="https:&#x2F;&#x2F;eater.net&#x2F;8bit" rel="nofollow">https:&#x2F;&#x2F;eater.net&#x2F;8bit</a> and ofcourse the nand-to-tetris book + resources (<a href="https:&#x2F;&#x2F;www.nand2tetris.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.nand2tetris.org&#x2F;</a>)

From the blog post: <a href="https:&#x2F;&#x2F;github.com&#x2F;wuxx&#x2F;TD4-4BIT-CPU" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;wuxx&#x2F;TD4-4BIT-CPU</a>

where can I find the full list of instructions?

Building the TD4 4-Bit CPU

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