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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

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TN3270 Plus Telnet Terminal Emulation


TN3270 Plus is a flexible, efficient and inexpensive terminal emulator application for connecting Windows PC users to UNIX systems via TCP/IP. TN3270 Plus supports VT100, VT220 and ANSI terminal emulation. TN3270 Plus has the features of large expensive products in a tight efficient package for outstanding performance with minimal resource usage.

Please see the TN3270 Plus Prices page for complete details and volume discount information. 


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30-day Evaluation
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Flexibility

TN3270 Plus supports Windows 10 (32- and 64-bit), 8 (32- and 64-bit), Server 2012, Windows 7 (32- and 64-bit), Vista (32-and 64-bit), Server 2008, Server 2003, XP, 2000, and NT. 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 and color definition.

Efficiency

Automate common tasks using the TN3270 Plus macro recorder/player or script language. Get more work done with less effort. Connect multiple sessions and use the tabbed interface to rapidly and easily switch between sessions. Customizable toolbars keep common functions at you finger tips.

Security (SSH)

Secure your information form eavesdropping and "man-in-the-middle" attacks. Add the TN3270 Plus Secure Shell (SSH) feature to protect your valuable data. TN3270 Plus supports SSH v1 and SSH v2 with a variety of encryption algorithms and encryption strengths up to 256 bits.

Remote Printing (LPD)

Print UNIX print jobs on a Windows printer. Add SDI's award-winning SDI LPD Line Printer Daemon. SDI LPD allows you to route UNIX print jobs to your Windows local  or network printer. Add SDI LPD to your TN3270 Plus configuration. Please see TN3270 Plus Prices page for complete details and volume discount information. 

File Transfer (FTP)

Transfer files between your PC and Unix. Add SDI FTP to your configuration and you have a full featured FTP client at your disposal. Please see the TN3270 Plus Prices page for complete details and volume discount information. 

Why pay more? TN3270 Plus - unsurpassed price performance! 

Download an evaluation version now. 

 

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