Sega Pico - turning pages

[+atari2600land]

So I was wondering if someone could possibly make a Sega Pico homebrew game. I read that it basically is the same as the Master System, which I could probably do, but how does it know when the page is turned? The Wikipedia entry doesn't say. I guess it would take some guy with extra time on his hands to make a Pico board to put in a Pico cartridge shell, so unless that happens, it'd have to be in a Pico emulator.

[krslam]

There are light detecting sensors of some sort that register when a page is turned and the corresponding sensor is uncovered. Look at the notches at the top of each page.