The terminals are 1980s era text-only computers used throughout Emtanon. Two of them may only be viewed via AS32, while others may be remotely controlled by players via the Emtanon portal.

The following basic commands are listed by help and have help text:

• help
• list [+all]: Lists the files in the working directory. +all also shows the modification times.
• make <name>: Creates a directory.
• open <name>: Changes the working directory down one level.
• return: Changes the working directory up one level.
• where: Displays the absolute path of the working directory.
• delete <name>: Deletes a file or directory.
• create <name>: Creates an empty file.
• read <name>: Displays the contents of a file.
• write <name> <line>: Appends a line to a file.
• clear: Clears the screen.
• beep: Makes a beep while briefly filling the screen with #s.
• play <duration-in-ms> <frequency-in-hz> <volume-from-0-to-1> <square|sine|triangle|sawtooth>
• run <name> <arguments>: Runs a program from the working directory.

Apart from these, the following undocumented commands are known:

• export: Uploads data to the agent systems; requires sysop privileges.
• line <begin-x> <begin-y> <end-x> <end-y>: Draws a line of #s on the screen.
• ohio <pin>: Activates a Cleveland Direct calling card.
• plot <x> <y>: Draws a single # on the screen.
• reboot
• sabre airport arrived <airport>
• sabre airport inbound <airport>
• sabre airport outbound <airport>
• sabre airport scheduled <airport>
• sabre airport status <flight>
• sys <address>: Executes machine code from the given memory location.
• utime: Current timestamp in the ISO 8601 format, e.g. 2023-10-31T09:33:32.930Z.
• wtime: Current timestamp in the XORFS format, e.g. Z 31093334Z OCT 23.
• wx <location>: Weather information.

These are some of the programs that are installed in the //programs directory.

This program is used to submit messages to AS27. The exact behavior depends on the invocation:

• > run as27: If AS27 is currently broadcasting zeroes, the submission appears immediately. Otherwise, it is queued to appear the next day.
• > run as27 overwrite: Unconditionally overwrites the current message.

Iris is an instant messaging service. Peers are identified using numeric talk groups. The terminal program presents its own command prompt, which accepts the following commands:

• check: Displays the pending message from the selected talk group, if any.
• diag: Displays the current talk group pair in form of RESOURCE PATH: //semaphore/iris/<A>/<B>.
• list: Displays the paths of all pending messages.
• quit
• talk <number>: Selects the destination talk group.
• tx: Prompts for the message to send.
• whoami: Displays the user's talk group, e.g. YOUR SEMAPHORE IS 19001.