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That was my conclusion as well: leave the ROM alone and do just the FPU thing. Andras

Yes I do. The full memory map is here: http://members.optusnet.com.au/eviltim/macmp3/Mac_Classic_II.pdf, but the expansion ROM is mapped right above the on-board ROM in the region $40B0_0000–$40DF_FFFF (or $40C0_0000–$40DF_FFFF for 2MB mode).

I thought about that. This certainly can be done, but it would make the board more complex (=expensive) and would add a largish FW project into the mix (not to mention the SW running on some host). Of course I also hoped that in-place programming would be possible within the Mac and only...

Yes, I'm aware of that board. I guess there's no functional difference (as far as FPU goes), but I would look at bulk-buy the chips as well to save money for everyone. i.e. this board is $100 + $xxx for the FPU itself. I *think* I can get that cheaper. Could be wrong of course... Andras

All, For various reasons I ended up designing a co-processor board for the Classic-II. It seems to be working fine, so I'm wondering if there's any appetite for it in the community and should I order a (small) run of the boards. I'm not looking to get rich on this project (i.e. I'm sane), so...