TN3270 Plus: Telnet Terminal Emulation Software for Windows supports TN3270, TN5250, VT100 and VT220 Terminals. Mainframe, AS/400 and UNIX connectivity. Support for 3278, 3279, 5250 and VT100 terminal emulation. An inexpensive terminal emulator.

Important Notice!

Dear SDI Customers,

We regret to inform you that as of 9/26/2025, SDI USA has ceased all operations. Due to the lack of sufficient management structure and an aging workforce, we are no longer able to meet the high standard of support and service our customers deserve. As such, we have made the difficult decision to terminate our company's operation.

Licensed customers are authorized to continue using their licensed software products without further License or Maintenance and Technical Support fees. However, no Technical Support services will be available. The software products affected by this change include TN3270 Plus, SDI LPD, and any other software licensed by SDI USA in the past. There will be no future product updates, no new releases, and no new licenses. The products should continue to perform their intended function until changes to the operating environment make it incompatible with our products. Feel free to continue using the products for no cost until you decide to move to another supplier.

We intend to keep the sdisw.com website available, but unmonitored until 12/31/2026. We recommend that you download the installation files, user guides and sample files and keep them in a safe place for your future use before the web site closes down.

We have witnessed monumental changes in the computer software industry during the past fifty plus years and have enjoyed working with so many outstanding companies and wonderful people over those years. We wish you all a prosperous future.

SDI USA

TN3270 Plus Secure Telnet Terminal Emulation for Windows

Overview

TN3270 Plus is a flexible, efficient and inexpensive terminal emulator application for connecting Windows PC users to IBM zSeries (mainframe), IBM iSeries (AS/400), UNIX and other Windows systems via TCP/IP

TN3270 Plus supports telnet, telnet 3270 (TN3270), telnet 3270 enhancements (TN3270E) and telnet 5250 (TN5250). TN3270 Plus includes terminal emulation for 3270, 5250, VT220, VT100 and ANSI terminals and printer emulation for 3287 and 5250 printers. All this in a compact easy to use product.

Efficient and Inexpensive

TN3270 Plus has the features of large expensive products in a tight efficient package for outstanding performance with minimal resource usage. For example, use Chinese and Japanese code pages to input and display Chinese or Japanese characters, automate common tasks with the scripting language or connect up to 99 terminal or printer emulation sessions of any type in any combination at the same time. Use WinHLLAPI or DDE to allow your applications to interface with TN3270 Plus. Use the TN3270 Plus FTP client for quick and easy file transfers. SSL and SSH support allow secure connections.

An innovative pricing scheme allows you to pay for only the features you need!

Flexible

TN3270 Plus supports Windows 11, 10, 8, 7, XP and Windows Server 2022, 2019, 2016, 2012, 2008, 2003 and 2000. A common interface to these operating systems allows deployment of the product throughout your enterprise without the support costs associated with multiple user interfaces. You may tailor the desktop interface to your specifications with keyboard mapping, color definition and customizable ASCII to EBCDIC translation tables.

User Comments

"We have used Attachmate's EXTRA! product for years, but as we add new PC's we are switching to TN3270 Plus, and whenever we need a print solution we are also switching to TN3270 Plus LPD. Great products at amazing prices! Keep up the good work."
-Bruce Coffey-, Colorado Bankers Life Insurance

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Why pay more? TN3270 Plus - unsurpassed price performance!

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Security Alerts!

telnet client, termnal, termnal emulator, termnal emulation, telenet, emulater, 3270 emulater, telnet, vt-100, vt-220, ansi, WinHLLAPI, HLLAPI, DDE

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