A Chronology of Microprocessors
processortimeline.info
processortimeline.info
0 - It has very short descriptions for each stage. There's not quite enough info to understand the "whys". Like it states that the 6501 was dropped after the threat of a lawsuit, but doesn't explain that it was because of it being pin-(and I believe signal)-compatible with the 6800, which the 6502 was not.
(month unknown) Motorola introduces its 6800 chip
https://en.wikipedia.org/wiki/Motorola_6800#M6800_family_int...
The first working MC6800 chips were produced in February 1974
The references on the site consist mostly of magazines and are noticeably absent of any manufacturer's databooks/datasheets, which I'd consider looking at first before anything else.
The AL-1 came almost 2 years before Intel and TI's first microprocessors debuted and ran 10 times faster than those chips.