Here is a little history showing the evolution of our favorite anime mecha role-playing game. If anyone has anything to contribute or spots an error or oversight, please let me know.
 
 

White Box Mekton

The very first Mekton published, it was more of a wargame or boardgame than an RPG.  The mecha battle on a hexmap representing an entire planet.  Here are scans of the front of the box, the front cover and the back cover.  Scans courtesy of Jim Milligan.

Mekton I

Mekton. Published in 1985. The first anime mecha role-playing game (Battltech was only a boardgame at this time.) Introduced the world of Algol. Click here for the cover image (20K). Click here for the counter sheet that came with the game (254K).

Advanced Combat System A rules expansion covering more combat options for Mekton

Roadstriker Introduced mini-mecha rules to Mekton.

Mekton II

Mekton II Second edition rules. Cover art by Ben Dunn Click here to see it (20K).

Roadstriker II

Mekton Empire Space-opera setting with expanded spaceship rules.

Mekton Techbook Advanced construction system and mecha manual. Introduced the scaling concept.

Operation: Rimfire Campaign-length adventure in the Algol universe.

Mekton Zeta

Mekton Mecha Manual 1 Predates final MZ rules. Not all designs are accurate with them

Mekton Zeta Third edition rules. Introduced Invasion: Terra setting. Cover art by Yuji Kaida

Mekton Zeta Plus Advanced construction rules for Mekton Zeta. Cover art by Yuji Kaida

Mekton Tactical Readout GM screen, simpified mass-combat rules & constructon ststem and Algol-based 1-shot adventures.

Mekton Zeta Wars 1: Invasion Terra Wargame scenarios in Invasion Terra setting.

Mekton Mecha Manual 2: Invasion Terra Files Mecha listings and roleplaying data for Invasion Terra setting.

StarBlade Battalion Mekton New setting set in the future 300 years after Cyberpunk 2020

The Future

There were, at some point, plans for a future edition of Mekton using the Fuzion rules-system, a variant of the existing Interlock system. These plans are currently postponed indefinitely.

Atomic Rocket Games has written a an eighty page campaign book called "Quicksilver Blues". Although R.Talsorian still plans on releasing this game, the release has been postponed for various strategic reasons.