PRONI has the admission and discharge records. They are not on-line and so a personal visit is required to view them. Either by you or a researcher.
Don’t expect too much from the admission records. It’s fairly basic information. The format varies slightly according to when the records were compiled but, in 1904 for example, you could expect to see:
1. Admission number
2. Date of admission
3. If previously relieved, reference to last register number
4. Name of Inmate
5. Residence previous to admission
6. Sex
7. Age
8. If adult, whether single, widower or widow; if child whether orphan, deserted, legitimate or illegitimate
9. Employment or calling
10. Religious denomination
11. Whether disabled and description of disability
12. Name of spouse
13. Number of children (which appears to be the number of dependent children, as opposed to the total number of children the person has ever had).
14. Observations of inmate when admitted eg “Casual & clean” or “To the infirmary”
15. Date of discharge or death