You can still run your old DOS programs right from macOS without having to power off your machine and boot up from your MS-DOS diskette by following these steps;

Steps to run DOS progam in macOS:

  1. Install Homebrew from the terminal. 

    $ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

  2. Install DOSBox via homebrew. 

    $ brew install dosbox

  3. Run your program's executable from DOSBox. 

    $ dosbox Downloads/Golden\ Axe/GOLD.EXE DOSBox version 0.74 Copyright 2002-2010 DOSBox Team, published under GNU GPL. --- CONFIG: Generating default configuration. Writing it to /Users/username/Library/Preferences//DOSBox 0.74 Preferences CONFIG:Loading primary settings from config file /Users/username/Library/Preferences//DOSBox 0.74 Preferences MIDI:Opened device:coreaudio

    You can download old DOS programs from sites such as Abandonia