Simply put this allows for a custom rom to be installed inside of a se/30 to skip things like the built in RAM check. You can also use any extra space to fit in a small system file.
I've based this off of the work of Doug Brown. And GGlabs MACSIMM.
You can find information about making a rom here (shoutouts to BMOW) And how to make a custom disk image here.
The max size of any rom image will depend on the size of the flash chips you use but the max is 4 4mb chips or 2MB in total. You can split any rom file you make into 4 pieces using the tool of your choice and burn that to each of the 4 chips.
You can program the chips individually with a standard flash programmer and a 32 PLCC -> dip adapter
BMOW's programmer may work but I have not tested it.
