[ksarul]

You might want to look at what Gazoo has set up over on AtariAge. The games cartridge he built is the first full image for this board other than some bank test software. Note, the procedure folks used to create a 64K cart work here as well, so long as you assemble the banks in the opposite order for the 378. The basic process is the same. You can also do this in test mode using Classic99, as there is support for these boards in it. That way you can experiment to your heart's content without having to burn each experiment into an EPROM to see if it works. Did I send you the manual for the UberGROM? That discusses the method of bank switching the 378 uses somewhat extensively. Acadiel has built a lot of 64K and 128K images for the earlier versions of the cartridge as well, so he's a great source for information too.