a600 ide controller and rom version

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It looks like my 600 has the old roms, the one with the broken ide support.  What's the best fix for this?  Can I use 1200 roms on the 600 or do they need to be 600-specific?  Should I just upgrade to 3.1 or stay with a later 2.05?  Does IDEFIX or something like a buffered ide interface fix this problem?  

brian

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Thanks for the response.  I'll get a 3.1 rom for the 600 and my 2000.