I've not had a chance to take it apart and have a look at the bottom side of the motherboard yet, I'll see if I can get a moment to do it!
If you can then look at the monitor connector pins:
If all pin present, then it is ISSUE 6, if one missing then it is 4 or 5. If the pins are wide then ISSEU 3, but if I know right then the first 100 machine have ISSUE 3 board.
If it is looks a a ISSUE 4 or 5 then try to watch the red marked soldering pins at the modulator via the bottom grille. If these are missing then it is a ISSUE 4.
If you can open the machine then watch the company name, if it is FLAN instead Enterprise then it is a ISSUE 4.
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The cartridge is a copy, I'm afraid!
Everyone have a copy... who have the original which is copied?