IM3270 Features
Comprehensive 3270 terminal emulation with modern productivity tools
Split Screen Sessions
PROWork with multiple mainframe sessions simultaneously in a single window. Compare data across systems, monitor jobs while working, or reference one session while editing in another.
Side-by-side (Ctrl+\)
Top-bottom (Ctrl+Shift+\)
Ctrl+Tab
Drag divider
Retro CRT Terminal Mode
NOSTALGICExperience the authentic look and feel of classic mainframe terminals. Perfect for those who remember the green glow of IBM 3278 terminals.
Classic P1 green
Warm P3 amber
CRT line effect
Bloom effect
Tube curvature
Frame overlay
Full 3270 Terminal Emulation
Complete IBM 3270 terminal emulation using x3270/s3270, providing authentic mainframe interaction.
Models 2, 3, 4, 5
Full EA/EAB
x3270 themes
Protected fields
IBM Plex Mono & IBM 3270
Secure Connectivity
Connect to your mainframes securely with SSL/TLS encryption and manage multiple connections with ease.
Encrypted
Save connections
Automatic
z/OS support
File Transfer
Transfer files to and from your mainframe using the standard IND$FILE protocol.
Standard protocol
Text and binary
Visual progress
Member transfer
Productivity Features
Boost your mainframe productivity with modern convenience features.
Alt+Up/Down
Record & replay
Smart selection
Session logs
Search screen
Customizable
Smart Selection
Keyboard Customization
Macros & Automation
JavaScript Scripting Engine
Automate mainframe workflows with JavaScript. Full-featured CodeMirror editor with syntax highlighting, API autocomplete, step-through debugger, and sandboxed file I/O.
Syntax highlighting, search, bracket matching
Type screen., session. for suggestions
getText, getLine, waitForText, waitForKeyboard
type, send, moveTo, typeAndSend
Line-by-line with pause/resume
Sandboxed readFile/writeFile
AI Agent Mode Pro
Describe what you want in plain English. The AI agent generates and runs a JavaScript script on your mainframe session - navigating ISPF, reading datasets, submitting jobs, and reporting results back to you.
Just type what you need - no scripting required
Works with both z/OS ISPF and MVS 3.8j / TK5
Agent can transfer files to/from mainframe using session.receiveFile/sendFile
Multi-turn: follow-up on previous results
Review generated script before it runs
■ Stop button or ESC key cancels running agent
Server-side REXX dispatcher on z/OS - faster and more reliable than ISPF panel navigation. Installs in minutes via IMINST.rexx from ISPF option 6.
Pre-configure the API key via ~/.config/im3270/setup.json (written by the installer) or the IM3270_AGENT_API_KEY environment variable for enterprise deployments
Console Output Log & Diagnostics
Built-in console panel with interactive command bar and automated log analysis for troubleshooting connection issues.
Real-time color-coded events: connections, errors, warnings, transfers
Built-in command bar: status, tabs, diagnose, history, and more
Automated analysis: timeouts, IP typos, SSL errors, port conflicts
Warns about suspicious IPs (e.g., 192.169.x.x) before connecting
Modern User Interface
A contemporary interface that makes mainframe work feel modern and efficient.
Multiple tabs
Color coding
Position tracking
Zoom tool