TN5250

Telnet Protocol Specification (854)
Telnet Option Specifications (855)
Telnet Binary Transmission (856)
Telnet Timing Mark Option (860)
Telnet End-of-Record Option (885)
Telnet Terminal-Type Option (1091)
Telnet Environment Option (1572) ...

5250 Telnet Interface (1205)
5250 Telnet Enhancements (2877)
IBM's iSeries Telnet Enhancements (4777)

IBM 5494 Remote Control Unit
Functions Reference
SC30-3533-04 (1995) ...

IBM 5250 Information Display System
Functions Reference Manual
SA21-9247-6 (1987) ...