At the risk of hijacking the thread, has anyone ever tried using an A500 style CIA chip to replace one on an A1200?
Years ago I got hold of a couple of A1200 boards that had had their CIAs removed, and I found the pinouts and soldered up the chips from an A500 onto the 1200 board.
It looked like it was going to boot, but then the power LED blinked some kind of error code and it didn't go any further... Either the boards had some other problem (likely) or something was wrong with the transplant...