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