Amiga 500 plus with 68020?

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Hi.  No, not directly as they are not pin compatible.  Someone could make an adapter I think, but the closest there is would be the CSA MegaMidget Racer.  Basically a 68020 running at 7.16MHz with no RAM.

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Hi.  Nope, typo - meant Midget Racer:

http://www.amiga-resistance.info/bboahfaq/index.php?action=artikel&cat=8&id=1906&artlang=de

Hopefully the link works.  Tiny board!

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I agree.  I had one of those Mega Midget Racer boards and barely noticed any speed increase.  I think it was measurable with a benchmark program, but the machine didn't feel faster at all.  Without any 32bit ram, most accelerators are a waste hanging off the CPU socket.

The other CSA products were good though.  I always wanted to score one of their external Turbo Amiga boxes for my A1000 - I was amazed when that was first announced.