I have some prototypes of first gen games, and they don't seem to like new hardware? Does xenon hardware have specific calls to that hardware not in slim?
Open the *Xex or *exe in any hex Editor, if it says XEX1, It will work on Beta Kits ONLY. Updated post: There's more to the executables. It all narrows down to 3 types, identifiable by their file extension and/or the ASCII string at the beginning of the file: Alpha: *exe/MZ and says "This program cannot be run in DOS mode" when opened in any Hex Editor. Beta1 (pre-1888.0): *exe/XEX1 or *exe/XEX- Beta2/Final: *xex/XEX2