During few month, I made research about combo games on Nintendo 64. So I tried all N64 games compatible 64DD, to see if they display errors messages like error 44 (Ram Pak) or error disk (wrong disk). The 3 combo games available everywhere are F-Zero X, Mario Party and Zelda OOT. Usa version don't boot at all with 64DD. Only F-Zero X displays error 44. Maybe cic chip issues. Results with pal version are different. F-Zero X doesn't boot with ram pak and 64DD. Zelda OOT boot normally. Mario Party displays errors messages like a japanese combo game. Errors messages are translated in english, french and german.