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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: How to Order


TN3270 Plus prices for orders of 10 or more copies can be found on the TN3270 Plus Prices web page.

  • If you are a new customer ordering 10 or more copies, please complete the form on the New Customer Order page.

  • If you are a new customer ordering fewer than 10 copies, please send an e-mail with your feature requirements to sales@sdisw.com.

  • If you are an existing customer adding additional copies or features to your configuration, please send an e-mail to sales@sdisw.com and explain the changes you want to make.

The following forms of payment are accepted: credit/debit card, PayPal, purchase order, check and wire transfer. 
SDI accepts credit/debit card payments on Visa, MasterCard, Eurocard, American Express, Discover, Novus, Diners Club, Cart Blanche, JCB, Switch and Solo. 

By registering for, and/or ordering, TN3270 Plus, by whatever means, you confirm that you have read and agree to the terms and conditions of both the product's License agreement and SDI's Maintenance and Technical Support Agreements.

 
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