OK here is the fast ugly hack version. Basically a smd part that has the 25 pins for the edge connector (available for part export from the temp parts bin with the fzz loaded) copied to the sketch twice, once on the bottom layer and once on the top layer. There are 25 vias all connected on the top layer, and one example via with clumsy routing on the bottom layer to give you the idea of what needs to be done there. The effect is that you (potentially anyway) all 50 pins available on both layers of the board. Now I go back to trying to figure out how to convince Fritzing to do this in a single part (which may or may not be possible). This should work, its just ugly.
apple2_edge_connector.fzz (14.3 KB)
when exported as gerbers and viewed it works as intended.
Schematic is OK, it appears as two sets of headers. Breadboard is less OK as it shows as two headers (which is what I cloned the part from). They should probably just be supressed which I haven’t done here.
Peter