Usually the way these boards work is to simply pull all the CPU pins out to a separate socket. Apple called their equivalent the "Processor Direct Slot" and I'

Usually the way these boards work is to simply pull all the CPU pins out to a separate socket. Apple called their equivalent the "Processor Direct Slot" and I'd assume the Amiga works in the same way. https://en.wikipedia.org/wiki/Processor_Direct_Slot https://en.wikipedia.org/wiki/Processor_Direct_Slot You can typically pull some lines down and the CPU will stop clocking, or the accelerator card can follow the CPU clock and bang data directly into it. It provides very low-level and direct control of the CPU.