There are various differences, the most noticeable are in pronunciation. - In Ulster the first syllable of a word is always stressed, unlike further south where other syllables may be stressed too. - long vowels in unstressed syllables tend to get shortened - Broad "bh" and "mh" are pronounced like [w], not [v] - the ending "-igh" is pronounced [i], "-adh" is pronounced [u] - "mn-", "cn-", "gn-" at the beginning of a word are pronounced [mr], [cr], [gr] - in some areas "ao" is pronounced [ɯ] (like "oo" but with spread lips) - in some parts of Donegal "-cht" is pronounced [-rt]. There are some differences in grammar too: - analytical verb forms are preferred over synthetic forms (i.e. "tá mé, tá tú, tá muid" rather than "táim, táir, táimid" - negative particle "cha, chan" (though "ní" is also used) Some words have a slightly different form: scaifte (scata), cruaidh (crua), fríd (trí), domh (dom), foighid (foighne) There are more differences, but that's what springs to mind at the moment. If you need to know anything else about Ulster Irish, just ask as that's the dialect I speak.