CREATE TABLE table_11703336_1 (cpu VARCHAR, ram VARCHAR, display_size VARCHAR)

what is the cpu for the calculator with 28 kb of ram and display size 128 64 pixels 21 8 characters?
SELECT cpu FROM table_11703336_1 WHERE ram = "28 KB of ram" AND display_size = "128×64 pixels 21×8 characters"
SELECT "cpu" FROM "table_11703336_1" WHERE "128×64 pixels 21×8 characters" = "display_size" AND "28 KB of ram" = "ram"