I'm trying to understand exactly why various chips were designed the way they were at different times, in the service of which I have a rather specific question:
When did MOS Technology upgrade to 5µm process technology?
According to a source quoted from https://en.wikipedia.org/wiki/MOS_Technology_6502 "The first 6502 was fabricated with 8 micron technology"; that would have been in 1975.
According to a comment in Limiting factor on sprite sizes "VIC-II and amiga OCS chipset were both using 5um technology" so they reached that process node no later than 1982.
So presumably it was sometime between 1975 and 1982 they got the upgrade to 5µm, but which year?