Sim390
From Computer History Wiki
Sim390 is an IBM 390 class mainframe emulator geared to running MUSIC/SP.
The homepage for the project is: http://www.geocities.com/sim390/
The latest version is 1.7
Feb 26, 2008 - Sim390 version 1.7 Version 1.7 of Sim390 is now available for download. It has improvements to the user interface, a new HTML help file, support for changing the font in local 3270 sessions, better and more complete emulation of floating-point instructions, and a minor bug fix for the IPM instruction.