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Tn3270 is a terminal emulation program for connecting to computers whichuse IBM 3270 terminals.Major features of the emulation include color, extended highlighting,support for different screen and font sizes, and SSL support. Some moreobscure features include support for the APL character set, and support forfile transfer and remote printing when tn3270 is used with an IBM VM/CMS host.The Classic version of tn3270 also supports 3179 graphics emulation.

There is no license fee for either commercial or non-commercial use of thetn3270 application.The tn3270 source code is freely-licensed for non-commercial use, but must belicensed for commercial use.

To use tn3270, the host computer must provide a telnet server which supportsthe extensions for 3270 terminals. On your Macintosh, you must be able toconnect to the host server using TCP/IP.

Although primarily a 3270 emulation program, tn3270 also supports ordinaryline mode telnet connections. This support allows tn3270 to operate with hostswhich establish a line mode connection before entering 3270 mode, as well as withline mode only hosts. When operating in line mode, tn3270 emulates a DECVT52 terminal.

Notes:

1. All versions of tn3270 X support the original 3270 extensions to telnet. The newer tn3270eprotocol is supported as an experimental addition to version 3.4.0.
2. Tn3270 may be used with hosts which support IBM 5250 terminals. However,not all 5250 functions will be available.

The latest version of tn3270 X, 3.4.0, is supported on Mac OS X 10.3.9 Panther through macOS 10.14 Mojave.Older versions of tn3270 X are available for use with OS X 10.1.5 and later, as listed under the downloads.The Classic version of tn3270, 2.5b5, is compatible with classic Mac OS versions.

macOS 10.15 Catalina is the first version of macOS which does not support the use of 32-bit applications.Many older applications, including tn3270 X, are 32-bit applications, and must be updated to the 64-bit model for Catalina.Unfortunately, this won't be possible for tn3270 X. Tn3270 X was developed using Apple's Carbon framework, which wasoriginally provided for porting classic Mac applications to OS X. When 64-bit support was being introduced into OS X, Apple madea decision to not support 64-bit Carbon applications. As a result, it's not feasible to update tn3270 X to 64 bits.The only solution would be a rewrite of the application, and there are no currentplans for a rewrite.Users of tn3270 X are encouraged to use the macintosh-tn3270mailing list to discuss alternatives to tn3270 X for Catalina.If you are a developer who would be interested in participating in an open-source project to implement a replacementfor tn3270 X, please contact Peter DiCamillo.

Version 3.4.0 is an update to version 3.3 that adds support for OS X 10.9 Mavericks.It has also been tested successfully with OS X 10.10 Yosemite through macOS 10.14 Mojave.Besides supporting the latest versions of OS X, it also includes experiment support for the tn3270e protocoland for client SSL certificates. See the release notes for more information.

• OS X Version 3.4.0, November 9, 2013, 2.0 MB
  (for OS X 10.3.9 and later)
  HTTPS download
  HTTPS alternate site download

• OS X Version 3.3b6, May 13, 2011, 2.0 MB
  (for OS X 10.3.9 through OS X 10.8.5)
  Disk image revision of February 8, 2013 with added code signatures.
  HTTP download
  Alternate site download

• OS X Version 3.2.4, July 24, 2006, 1.7 MB
  (for OS X 10.2.8 through OS X 10.6.8)
  HTTP download
  Alternate site download

• OS X Version 3.1.7, May 1, 2006, 1.7 MB
  (for OS X 10.1.5)
  HTTP download
  Alternate site download

• Classic Version 2.5b5, March 13, 1996, 777 KB
  (for classic Mac OS versions before 10.1)
  HTTP download
  Alternate site download

tn3270 X 3.4.0 Release Notes, November 9, 2013
PDF format
RTF format

The tn3270 archive sitecontains current and older versions of tn3270, source code for the Classic version,and other tn3270-related files. Source code for tn3270 X is not currentlyincluded in the archives, but is available from the author upon request.

A tn3270 mailing list, macintosh-tn3270, is available for discussing tn3270. It is also used for announcements of new test and final releases. To join or search the listarchives, go to the macintosh-tn3270list web page.

tn3270 for the Macintosh was written by Peter DiCamillo.It includes code written by Greg Minshall to support the tn3270 telnet protocol,Copyright © 1984-1988 by the Regents of the University of Californiaand by Gregory Glenn Minshall.

Development of the Classic version of tn3270 was supported by Computing and InformationServices at Brown University. Also, the Classicversion includes the NCSA TCP/IP Kernel for the Macintosh, written by Tim Krauskopfand Gaige B. Paulsen, Copyright © 1987-1988 by the Board of Trustees of theUniversity of Illinois.

The icons for tn3270 were done by Steve Klingsporn.

The original version of this web page was contributed by Andrew Starr.

Mainframe Emulator For Macos Download

tn3270 for the Macintosh Classic version Copyright © 1988-1996 by Brown Universityand by Peter DiCamillo. OS X version Copyright © 2002-2006 by Peter DiCamillo.

Mainframe Emulator For Mac

Updated October 10, 2019