OK.

I went through the Google search again and, like TheMac Guy, found the best picture of a MacSnap installation to be in the linked he referenced. I gather that the pic of the logic board shows both the SCSI (524S) and RAM (?) expansion boards in place.

I don't know where the ROM chip is located on a 512k logic board but it sho nuf needs be under one of the expansion boards, most likely the SCSI board.

This close-up shows how snuggly the MacSnap expansions fit on the 512K board. In the centre the MacSnap SCSI card can be seen clearly. This card plugs into the

ROM sockets and Mac Plus ROMs are installed to provide support for SCSI and the

internal 800KB floppy drive (a standard early series 800KB drive is fitted).

Click to expand...

Based on this quote, maybe Gorgonops and markyb86 each have a part of it - my little board is just a mounting adapter for the SCSI board or to install the RAM expansion & 800k drive capability without the SCSI board?

Does anyone have a use for it?