Repairing an old electronic game MB Logic 5

If you know what this "Logic 5" game is for and how to use it please tell me.

I got some basic infos from googling here:
- English: http://www.handheldmuseum.com/MB/CompIV.htm
- Direct link to the manual: http://www.handheldmuseum.com/Manuals/MB-CompIV.pdf
- German: http://tote-pixel.de/pixel/72-milton-brad.html

As you probably know I am collecting historical computers and sometimes some other electronic stuff. At times I have to fix some of the hardware. This is a simple example of me doing this. Even with the simplest tools you can probably use for this. I could have done it somewhere out in the woods by carrying just about four vital items for that job:
- Gas driven soldering iron
- tin-solder
- My Victorinox Swiss army knife model "cybertool"
- A lighter

Of course I do not do soldering in the woods at -5°C if I don't really have to. But I could have done it.

For my political side follow me on twitter @chabis_ch.

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