Google diving. I got curious as to what the keyboard controller was, so I looked up motherboard pictures and specs and eventually found that it uses an ENE KB910 for the keyboard controller. Searching there for how things were set up was mostly fruitless, until I stumbled upon a russian forum which had a pinout for the KB910 [1]. A few more stumbles and I found a result that stated that Compal was the OEM for the laptop -- it's not uncommon for laptops to be made by a white box maker. From there, a search for the model number brought up multiple sites with the schematics.

[1] http://bit.ly/2ob7YaG Not the actual url, because chrome's history ate that.

Impressive :) Thanks a lot for your dive into the subject. It's darn interesting indeed