I just finished the schematic for the v2 version of pokeymax. This takes in feedback I received from the run I entered into the hardware contest last year.
The changes I made are:
i) Size reduced. Its now 21.4mm x 52mm, which should fix clearance issues in some arcade pcbs.
ii) It will use better machined pins
iii) Higher volume audio output
iv) Removed the extra capacitors and resistors included on v1 in error.
v) Faster pot reset
vi) Added A5 pin to su
A quick summary of the versions! Essentially there are only 3 FPGAs currently shipping. 02,04 and 08. Then there are a selection of cores (Retronics sells them by core) which can fit on any FPGA big enough, though technically as long as the FPGA has enough space it can fit any core.
Cost FPGA only (digikey) USD