Applying to Irish/Northern Irish schools with Scottish qualifications

I'm a Scottish nat5 (s4) student who wants to apply for universities in Ireland or Northern Ireland. I want to do this without doing s6. TCD doesn't accept students without advanced highers, so I likely won't be able to go there. However, the other universities don't mention (anywhere??) what Scottish qualifications I need. Does anyone know which ones I do? Or how I can convert them into the point system they all seem to use?