SD v2.2 interface

-oh, wait another minute-
I forgot that this product already have a dual logic: Floppy and ROM emulation, right?
So, tell me if I'm wrong, it should only be a matter of converting ExecROM scc on different slot logic to your loader? And then, we could have (with no further mods) MG2 with SCC running on it (using an scc cart on 2nd slot)?

I wrote a set of tools that convert the ROM into set of BINs and then into WAV (via MicroWAVer) that you can use via CAS port to fill the flash on SD drive. It sure works, but of course this way is not very convenient.

How about auto-recovery logic that will check on boot the inserted SD card, and if it finds special file (or if some key/switch is on) loads the file or pre-defined sequence of sectors from the card ? This way you won't need additional flash chip.

I dont think autorecovery logic will work as best option as you need to 'recover' everytime you want to flash another game into the device first.
having 2 flashroms would be easier. Flashroms are not that expensive and adding logic for it would not be too hard.
my first concern is now to get the 'basic' version 2.2 up and running. Still doing some slight modifications before I order.
Keep you posted on the progress. Ordering of the PCBs will probably be beginning of next week

Today I sent in the order for the PCBs. With any luck I might even be able to shave off some money from the total costs per interface if there is enough interest and the gold fingers don't add up too much

Here is an image of my prototype: