CREATE TABLE table_203_489 (id DECIMAL, "year" DECIMAL, "title" TEXT, "system" TEXT, "developer" TEXT, "publisher" TEXT)

when ghostbusters was released for the nes in 1988 what systems had it previously been released for ?
SELECT "system" FROM table_203_489 WHERE id = (SELECT id FROM table_203_489 WHERE "title" = 'ghostbusters' AND "year" = 1988) - 1
SELECT "system" FROM "table_203_489" WHERE "id" = (SELECT "id" FROM "table_203_489" WHERE "title" = 'ghostbusters' AND "year" = 1988) - 1