To be honest I do not know how many pins, I have heard of 24 pins. I thought mine was a 6 or 9 pin printer, but I got mixed up trying to remember
The one I have is a Epson FX-100 given to me by a relative maybe 25 years ago. So I did a search. It replaced a Wang 80 col dot-matrix which I gave to another relative, that Wang Printer is now gone
Interesting enough, seems epson still makes dot-matrix printers.