@Rik do you still have CGL Super Kong, or do you remember a glitch where the jump button wouldn't work right on the 1st level?
It used to lock up on MAME but I think I fixed that, instead it will cause a small glitch. Easiest way to test this is stand at the bottom-left corner (under the ladder) and keep jumping up. In MAME, you will sometimes appear on the 2nd floor after jumping. Happens once every 50 jumps or so.
Okay, had to recompile MAME to see what you were seeing...
Jumping a lot made it kind of glitch-out and he suddenly appear two levels up, and I could do it fairly quickly.
I do still have this game (the CGL version), and I can't make anything weird happen after 15 minutes of pounding the jump button... So it does still seem to be doing something weird in MAME...
Found a few more games I can send also:
Gakken Super Corbra (the green one)https://www.handheldmuseum.com/Gakken/SuperCobraGreen.htm
Gakken Defender (the red one)https://www.handheldmuseum.com/Gakken/Defender.htm
This has an HD38820 64-pin DIP processor. I can't see the top as it's under the VFD, but the circuit board claims it's an HD38820-L53
Actronics Wanted G-Manhttps://www.handheldmuseum.com/Actronics/WantedGMan.htm
(The Ludotronic 'Operation Z' version...)
I have more in storage, but I think I'll hold off until we get the ones I currently have on hand done.