6581 signifies the MOS Technology 6581 sound chip, found in the Commodore 64 line of computers. 6581 is often referred to as the "old SID", since it was the first of two models - the 8580 followed in newer models of the Commodore 64. More information at Wikipedia).
A highscore-saver functionality was implemented in the game in the cracking process, preserving scores between games even if the computer was turned off.
A trainer offers one or more cheats like unlimited lives, invincibility, more ammo etc. Because this is done during runtime a trainer is not to be confused with a savegame editor.
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