Cant find chip for 1987 supra turbo
 

I recently bought a 1987 supra turbo with 58,000 original miles and am looking to make a few upgrades. This car will be my daily driver, except for the winter, and am looking to throw in a performance chip except I cant find a performance company that makes a chip for the 1987 year. I can find a chip for 88 and up, but no 87. Can anybody tell me where I can find one if there is one offered? Also if there isn't one offered, why not? What is the difference between the 1987 and 1988 model that would cause a chip to not be offered? Please help!!!