I would recommend those that doesn’t have a remaster version on current systems. Personally I’d recommend:

• Armoured Core 3
• Armoured Core 3: Silent Line
• Armoured Core 3: Last Raven
• Front Mission 4
• Zone of the Endere
• Zone of the Enders 2
• Another Century’s Episode
• Another Century’s Episode 2
• Another Century’s Episode 3: The Final