IIRC the IBM DisplayWriter. The cables were thin and came to a non standard
D sub 9 pin. There was a cut sheet feeder that might plug into the other port.
It has been a long time.
I think the System 23 also may have connected to that printer also. There
weren't many IBM daisywheel printers.
I had a lot of those go through my hands about 15 years ago.
Paxton
Astoria, OR