Original Rotation System
From Hard Drop Tetris Wiki
This rotation system was used in the original versions of this game. So keep circulating the tapes.
This only exists through videos of the game.
It is absolutely identical to Nintendo Rotation System, right handed version, except that the horizontal orientation of the I piece is one block higher.
Games using this rotation system generally have no wall kick, no lock delay, no ARE, and depend on keyboard repeat rate for their DAS.