HP 98568A Installation Instruction page 363

HP 25638, 25648 and 25668 Printers
Description and Support
The HP 2563B, 2564B and 2566B are dot-matrix impact printers. They
connect to an HP-IB interface, and include installation by an HP Customer
Engineer.
HP 25638, 25648 and 25668 Printers
Series 300 HP-UX Operating System Support
on Release with Model
5.0 or later
all Series 300
Adding Printers 7 -15