Found this...
DSTWO FPGA Interface
I don’t know the details, but here is some information necessary to implement ntrcardhax.
#Ports FIFO: 0xB4000000
Control: 0xB4000002
Control2: 0xB4000004
##Control 5: FIFO clear
7: Mode for compatibility?
10: Mode
#Initialization ```C #define...