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Over Thirty Years of Software Innovation... |
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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 DownloadThe sdisw.com web site closes down on December 31, 2026. Please download and save any files you need before that date. The TN3270 Plus User Guide is on this web site in HTML format and will disappear when the web site closes down. Links for the TN3270 Plus User Guide in Windows Help format and PDf format are included below for you to download and save.Current TN3270 Plus ReleasesClick the link to download the desired version of TN3270 Plus. You must have valid license code details (licensee name and license code) to run TN3270 Plus. TN3270 Plus Release 4.08. Includes TLS version 1.3 support. TN3270 Plus User GuideThe TN3270 Plus User Guide in Windows Help format. The TN3270 Plus User Guide in PDF format. The SDI FTP User Guide in Windows Help format for TN3270 Plus users with the FTP feature The SDI FTP User Guide in PDF format for TN3270 Plus users with the FTP feature. The SDI LPD User Guide in Windows Help format for TN3270 Plus users with the Print feature The SDI LPD User Guide in PDF format for TN3270 Plus users with the Print feature. Older TN3270 Plus ReleasesIf your license code is older and not valid for the current TN3270 Plus releases, downloading an older TN3270 Plus release should allow you to use your license code. Some of the older releases may not run on the most recent versions of Windows. Additional Customer DownloadsThe customer downloads page contains additional downloads. The downloads include:
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