MechWarrior 2: Resource Forum

http://www.games4win.com/games/battletech/

I dunno if it is truly freeware
but the site says it is

I would doubt if it's freeware, it was released for Sega Genesis (yeah, there's a ROM of it, not telling where).

And then again, there was MechWarrior 3050 for the SNES, which was a port with a few enhancements.

What the SNES version had:
+ Better music
+ Life was a bit easier due to manual torso twist
+ More cheat codes

What the Genesis version had:
+ Better weapon sound effects

Even if that was irrelevant, I think that shed a little light.

i hated the PPCs inthe game

you had to Charge it up for it to do more damage
or if you charged it too much, it would destroy the weapon

I'm gonna download it just to try it out.