it would be remiss to not mention the most excellent ben-eater's 8bit-computer https://eater.net/8bit and ofcourse the nand-to-tetris book + resources (https://www.nand2tetris.org/)
But why is this always the first comment on custom CPU builds? Can't there also be other designs out there?
But why is this always the first comment on custom CPU builds? Can't there also be other designs out there?