What platforms are the elderscrolls available on

The Elder Scrolls is a series not a game.
The iterations of the series have appeared on multiple systems, however.

Elder Scrolls 1: Arena ( PC/DOS )
Elder Scrolls 2: Daggerfall ( PC/DOS )
Elder Scrolls 3: Morrowind, Bloodmoon, Tribunal ( PC, XBox )
Elder Scrolls 4: Oblivion ( PC, XBox 360 , PS3 )