What is the difference between the 1993 and 1993.5 Toyota Supra (USDM)?

I know that in the United States, the Toyota Supra came in a 1993 model and a 1993.5 model. What is the difference between the two? Was the 1993 just the first Supra, then they came out with the 1993.5 as the "Premier Edition"? Thank you.
 
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