HP laser jet 1320n

Dear Sirs, for quite a few years I have run the above with your software 
faultlessly and today it has gone on strike, and I have 2 cartridges 
left from a friend, who was going to throw it away.
I am on macintosh yosemite, with no problem. There seems plenty of life 
in it. I want to be careful as macintosh seem to change OS s at speed 
today, so I have to o some planning
Please reply quickly as I am moving house this week
Yours sincerely
Peter Davenport