Motorola used to have a one bit microprocessor, the MC14500B.
The original 2019 post by Garbage [1] attracted the most comments. But in a reply to one of the subsequent posts [2] I talk a bit about actually coding for the thing. :)
Usagi Electric 1-Bit Breadboard Computer P.01 – The MC14500 and 555 Clock Circuit https://www.youtube.com/watch?v=oPA8dHtf_6M&list=PLnw98JPyOb...