Ulster dialects
The most important of the Ulster dialects today is that of the Rosses (na Rosa), which has been used extensively in literature by such authors as the brothers Séamus and Seosamh Mac Grianna, locally known as Jimí Fheilimí and Joe Fheilimí. This dialect is essentially the same as that in Gweedore (Gaoth Dobhair), the same dialect used by native speaker Enya and her siblings in Clannad.
Ulster Irish sounds very different and shares several in Ireland unusual features with Scots Gaelic, as well as having lots of characteristic words and shades of meanings. However, since the demise of those Irish dialects spoken natively in what is today Northern Ireland, it is probably exaggerated to see Ulster Irish as an intermediary form between Scots Gaelic and the southern and western dialects of Irish. Indeed, Scots Gaelic does have lots of non-Ulster features in common with Munster Irish, too.
One noticeable trait of Ulster Irish is the use of the negative participle cha(n), in place of the Munster and Connaught version ní. Even in Ulster, cha(n), most typical of Scots Gaelic, has ousted the more common ní only in easternmost dialects (including the now defunct ones once spoken in what is now Northern Ireland). The practice seems to be that cha(n) is most usually used when answering to a statement, either confirming a negative statement (Ní aon mhaith ann - Chan fhuil, leoga = "It is no good" - "Indeed it isn't") or contesting an affirmative one (Tá sé go maith - Chan fhuil! = "It is good" - "No, it isn't!"), while ní is preferred in answering a question (An bhfuil aon mhaith ann? - Níl = "Is it any good?" - "No"). (From www.irelandinformationguide.com)