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@joshc I do it only for fun and because I can do it and just because. I like play with hardware by tweaking, overcloking, upgreading it, etc. I don't need faster Mac, I've got PC. I'm only interested in 68k Macs and I choose 475 model because it is the fastest model in "pizzabox" (I like it)...

Hi, thanks for the answer. 060->040 adapter is not an Amiga trick. It is official feature of 68060 CPU described in MC68060 user's manual. Something like 68040 fallback mode. Chapter called "Using an MC68060 in an Existing MC68040 System ". There is also info about "MC68060 to MC68040 PGA to PGA...

Hi, I'm Amiga user but recently I've bought Macintosh 475. According to threat on Mac68k forum I've tried my 060->040 adapter with full 68060 CPU from Amiga with this Mac. When I power on it I've got not "beep" sound as in normal operation but something like "melody". I think that's mean CPU is...