DESC: DALLAS -- April 22, 1999 -- Texas Instruments, a leader in educational technology, has introduced the TI-30X IIS and the TI-34II Explorer Plus Teacher Kits at the National Council of Teachers of Mathematics (NCTM) conference in San Francisco today. The TI-30X IIS was first introduced in January in the retail market and will be available for the instructional market beginning this summer. Both products are advanced scientific calculators for general mathematics, algebra, trigonometry, statistics and science coursework.