Legal issues for remakes

Blitz3D Forums/Blitz3D Programming/Legal issues for remakes

The forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.

I am working my way through learning Blitz3D, and decided to write a remake of an old C64 game. However, I am not sure about the legality of producing an exact remake of the game.
Admittedly I will be using new graphics and producing it in full 3D with a couple of extra twists to it, but I am not sure whether this is overly legal. I'm mainly wondering whether because the platform no longer exists as a readily obtainable machine, that the copyrights do not hold any more (people can download the original game for free and run it on an emulator).
Does anyone have any info with regards to remakes / homages to games (especially if they were originally produced on other platforms that are no longer readily available). Cheers for any response.