When an accelerator is plugged in the CPU slot of an Amiga 1200, its CPU takes over the 68020 of the motherboard. Everyone knows this. What i'm curious to know is whether the 68020 is used at the initialization phase and if the Amiga will be able to boot even if it is damaged.
Possibly.
On the original german A2000 you had to take out the main CPU if you added an accelerator as there was no way to disable it.
Missing is probably ok, if it's damaged then it might create bus activity that stops the accelerator from working.
