Original sentence: The difference between these alphabets and IPA is relatively small, although often the special characters of the IPA are abandoned in favour of diacritics or digraphs in these alphabets, since many typewriters and older computers have no support for the many special characters of the IPA
Edited sentence: The difference between these alphabets and IPA is relatively small, although often the special characters of the IPA are abandoned in favour of diacritics or digraphs in these alphabets, since many typewriters and primitive computers have no support for the many special characters of the IPA