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But I was not so interested into A500 design since there are other people who are building that, Zeus, ACA and there is also mem upgrades and such thing
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Well there's almost no difference except CPU socket between A500 and A600 versions since they used the very same logic. As for Zeus68k it's something different from what you offer. It uses real 68k but with 24 bit address space so no more fast ram than what you can obtain on stock A500/+. And of course it uses OVERCLOCKED 68SEC000 which isn't such a great idea imho (same applies to ACA). With TG68 and some tweaks to it I've seen somewhere around the web you can go as fast as some 30-40MHz with 2-3x performance per cycle of original one, 32bit adressing so more than 8MB fast... and really nice fastram based on cheap SDRAM chips (e.g. MT48LC32M16 I acquired some time ago) 3V3 so can connect directly to FPGA. And since there are already numerous turbo cards for A600 too (ACA, Furia) I guess you shouldn't abandon Vampire 500 just yet
