Very interesting video about the context and steps that lead to the Z80 being invented and successful, then how it was a (superior yet compatible at every level) variation from the Intel microprocessor of the time (the 8080), the reason why the bright future of Zilog and Z80 was crippled (teasing you here) and Intel caught up, how the superior successor of the Z80 by the same team would lose due to another company (guess which one, yes it's one of the usual suspects).
(1287) Intel's worst Nightmare - YouTube (https://www.youtube.com/watch?v=P1aqtfXUCEk&t=604s) by LowSpecGamer