Texas Instruments Scientific TI-36 Solar Calculator

Very Vintage Texas Instruments Scientific TI-36 Solar Calculator Anyone collect these early tech calculators? Late ‘80s. Solar and all buttons work although some letters and numbers are worn. Guidebook is in great condition inside with handwriting only on the pictured page. Exterior in less than perfect condition as pictured. Calculator is a littlele smaller than today’s average cell phone at 5 1/4” x 2 3/4”.