Logon System is a French demo group which is very famous due to really great demos and new techniques the coders at Logon use. While The Demo was for a very long time the best megademo ever released on the CPC, Overflow's demo III was one of the most extreme hardware demo ever produced.
- Members of the group regularly wrote articles published in the French Magazine Amstrad Cent Pour Cent during its later life.
- During the 2010s decade, Overflow still wears the mantle of Logon System's legacy, sometimes competing successfully at demoparties or trying to be a legend again with goodies to match his ambition.
- 2017 : Eerie Forest (PLUS/GX4000)
- 2017 : Logon's run - 3D meets the aging bits (CPC6128)
- 2015 : iO (MSX)
- 2012 : Yet Another Plasma! (CPC 4k intro)