CREATE TABLE table_204_121 (id DECIMAL, "year" TEXT, "game" TEXT, "developer" TEXT, "setting" TEXT, "platform" TEXT, "notes" TEXT)

what year is the first appearance of the platform ps1 ?
SELECT MIN("year") FROM table_204_121 WHERE "platform" = 'ps1'
SELECT MIN("year") FROM "table_204_121" WHERE "platform" = 'ps1'