If you want to use MTS with Hercules, you'll need a 3270 terminal emulation program. Here are some hints:
tn3270 for the Macintosh, see https://www.brown.edu/cis/tn3270/index.html#latest or http://www.brown.edu/cis/tn3270/
Vista tn3270 for Windows, see http://www.tombrennansoftware.com
See http://x3270.bgp.nu/ for:
On 21 June 2011 Mike Alexander reported:
x3270 is available via MacPorts (http://www.macports.org/ and https://trac.macports.org/browser/trunk/dports/x11/x3270/Portfile). I just installed it and it seems to work ok once I figured out that you can't connect to "localhost" since that tries an IPV6 connection which doesn't work (probably because Hercules doesn't support it), and it won't fall back to IPV4.The Hercules General Information document has additional information about tn3270 clients.
From: Steven J Gold
Subject: [H390-MTS] New version of tn3270 released for OSX 10.9
Date: November 10, 2013 9:48:19 PM EST
tn3270 is a terminal emulation program for connecting to computers which use IBM 3270 terminals. Major features of the emulation include color, extended highlighting, support for different screen and font sizes, and SSL support. Some more obscure features include support for the APL character set, and support for file 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 the tn3270 application. The tn3270 source code is freely-licensed for non-commercial use, but must be licensed for commercial use.
****What's new in this version: Version 3.4.0 is an update to version 3.3 that supports OS X Mavericks***. It also includes experiment support for the tn3270e protocol and for client SSL certificates.
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Read more: tn3270 for Mac - Free download and software reviews - CNET Download.com http://download.cnet.com/tn3270/3000-20432_4-75860370.html#ixzz2kIjzqVI5