I'm also trying to take into account that a lot of technological advances that didn't come from the Shivans may have come from the reconstruction period (flak maybe?).
Suitable for all space battles - defensive and offensive - medium payload (16.5 Kt) - infrared tracking and semi-intelligent targeting - pilot chooses desired target, and the MX-50 tracks the chosen target based off the emission of heat from the - engine, the weapon bays, and the cockpit of the target ship - the MX-50 will always attack a target that is determined to be hostile by the onboard computer of any GTA combat vessel, thus ensuring a higher kill rate, should the pilot find himself in a heated battle situation where precise aiming might be difficult. Early experiments with energy based defenses like the deflector array at Ross 128 have shown that this weapon is exceedingly weak against anything besides steel based targets.
^That's the only mention of it that I know of, however.