CREATE TABLE table_2490289_1 (pc_demo VARCHAR, c64_demo VARCHAR)

What won best pc demo when tower power (camelot) won best c64 demo?
SELECT pc_demo FROM table_2490289_1 WHERE c64_demo = "Tower Power (Camelot)"
SELECT "pc_demo" FROM "table_2490289_1" WHERE "Tower Power (Camelot)" = "c64_demo"