ðə lˈæɾɚ fˈɔːɹmæt wʊd jˈuːʒuːəli hæv ɐ smˈɔːl dˈɪmpəllˈaɪk hˈoʊl bˈɜːnd ˌɪntʊ ðə kˈɑːɹtɹɪdʒᵻz bˈɑːɾəm lˈeɪbəl ˈɛɹiə, jˈuːʒuːəli mˌeɪd wɪð ɐ hˈiːɾᵻd sˈɑːdɚɹɪŋ ˈaɪɚn.
The latter format would usually have a small dimple-like hole burned into the cartridge's bottom label area, usually made with a heated soldering iron.