Taking a look the screens, it's hard to believe that this arcade machine has been created in 1990, year in which we enjoyed things like 'Alien Storm'.
Yes, '4 en Raya' is made using a board with a Z80, and it seems an Amstrad CPC game.

The developing is what we can expect for a "4-in-ray" machine, but coder added somethings to make it very more "arcade".
First, we can shoot arrows or shots (depending the player we control), to destroy the "eyed chips" of the rival while they are falling, to make him lose his turn. Moreover, we'll see some obstacles as worms, spiders... whose will avoid that we can put the chips in the correspondent way.

The idea, as you can see, is not so bad, but the old-style doesn't invite us to play. Imagine finding this machine in a place beside first Neo Geo games or Out Run, in the earlier 90's.