Epson EPL-N1600 Reference Manual page 79

The coax and twinax connectors each contain a parallel interface.
since the printer's built-in parallel interface remains active, this
gives you two parallel interfaces and a coax or twinax interface.
Print jobs can be sent to any connection, and the printer
automatically switches between the active ports.
The twinax interface is compatible with the following IBM
systems: AS-400, System 36, 5251 (model 12), System 34, System
3
38, and 5294. When equipped with the EPSON twinax interface,
the printer can be used in place of the following IBM system
printers: 4210, 5224 (models 1 and 2), 5256 (models 1, 2, and 3),
3218 (non IPDS), 4214 (model 2), 5225 (models 1, 2, 3, and 4), and
5219 D01, D02.
The coax interface allows the printer to be connected to the
following IBM control units and mainframe systems: 3174, 3276,
4274, and 3270.
To add a direct connection to a Macintosh computer with the
optional EPSONScript Level 2 Package, use the AppleTalk
Interface Card (C82312 ) or Ethernet Card (C82357 /C82362 /
C82363 ).
Note:
If you reset the printer while it is receiving data through the AppleTalk
Interface Card, you need to turn the printer off and then on again before
it can communicate properly.
To add a direct connection to your GPIB network, use the GPIB
Interface Card (C82313 ).
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