PC/370

PC/370 is a simple System/370 emulator that simulates a few mainframe environments, and provides the means to build assembly programs on the PC, and run them.

• http://don-higgins.net/pc370.htm

PC/370 is generally considered obsolete, and it no longer needs to be paid for.

Links of interest

• http://www.billqualls.com/assembler/ A PDF copy of the book "Mainframe Assembler Programming" released by its author.