Where to get chipsets? well no idea! My reason to do this is to make old dead machines live again. my experience is that most faults on 1200s isn’t the chipset but corroded PCBs and shorted ceramic caps etc. so put in all new passives. move the chipset and logic and connectors and viola..
Source: Introducing the Re-Amiga 1200 | John “Chucky” Hertell