Foundation or terminal standard

SGA

Telnet Suppress Go Ahead Option

Widely used Documented current use

Enables the full-duplex terminal behavior expected by modern interactive MUD sessions.

Protocol overview

First seen: 1983
Present-day status: Widely used
In use today?: Yes, with documented current use.
Legacy?: No.
Layer: Foundation or terminal standard
Transport: Telnet option 3
Telnet option: 3
Research validated: 2026-08-29

Current use and fit

Commonly negotiated by MUD servers and clients.

Implementation essentials

Negotiate SGA independently in each direction.
Use EOR when an explicit prompt boundary is needed.

Compatibility and safety notes

Suppressing ordinary GA does not imply EOR support.

Original specifications and sources

RFC 858 Suppress Go Ahead Standard

Where an original site has disappeared, a preservation archive is linked and identified as such. MUDVerse does not claim authorship of the original protocol.