Before they decided on PowerPC, they had a failed attempt at building their own RISC CPU: https://thechipletter.substack.com/p/the-first-apple-silicon-the-aqua

Before they decided on PowerPC, they had a failed attempt at building their own RISC CPU: https://thechipletter.substack.com/p/the-first-apple-silicon-the-aquarius-7cb https://thechipletter.substack.com/p/the-first-apple-silicon... https://archive.org/details/scorpius_architecture https://archive.org/details/scorpius_architecture