What is the cpu of the calculator released in 1993?
CREATE TABLE "table1_11703336_1" (
  "calculator" text,
  "cpu" text,
  "ram" text,
  "display_size" text,
  "programming_languages" text,
  "link_abilities" text,
  "year_released" text,
  "predecessors" text,
  "successors" text
);
SELECT "cpu" FROM "table1_11703336_1" WHERE "year_released"='1993';