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

  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