Hi Krikzz, thanks for the photographs of the prototype boards in your earlier post.
If I read the chip numbers correctly, that means that you're using ...
2 x ALVC16424S 16bit 3.3V-5V transceiver
1 x 50MHz oscillator
1 x Lattice/SiliconBlue iCE40HX1K FPGA (1280 logic cells, 64Kbit embedded RAM).
1 x FTDI FT245RL USB2 to parallel FIFO (up to 1MB/sec).
1 x Micron CellularRAM PSRAM MT45W?MW16
either ... MT45W4MW16BGX 4MBx16 (8MB)
or ....... MT45W2MW16BGX 2MBx16 (4MB)
or ....... MT45W1MW16BGX 1MBx16 (2MB)
Since I can't see a CPU in there, I'm going to assume that you're controlling the whole thing with the PCE's CPU ... which would mean that the cart memory is CPU-writable so that you can load it up from the SD-card in your menu system.
If that is the case ... could you please give us the option to keep that memory CPU-writable once the ROM starts running?
There are a lot of developers and translators that would like some extra RAM on the PCE ... for running a custom System Card 3.0 with 512KB of RAM (or more).
If the whole RAM (4MB or 8MB I'm guessing) were available through a mapper (I'm going to guess that you've implemented the Street Fighter mapper) ... then that would be stunning ... it would allow a whole new generation of PCE homebrew!
Another request would be to allow people/developers to store an "autoboot.pce" ROM image on the SD card so that we can boot straight into a ROM without going through your menu system.
I do hope that you'll consider these requests, and let us know what you're planning ... thanks!