This tutorial shows how to install QB64 and QBasic 1.1 on Mac. QB64 is a modern version of QBasic and runs natively on Mac. QB64 for Mac needs the xCode Command-Line Tools installed.

QBasic 1.1 needs to be run in DOSBox in-order to run on Mac. QB64, xCode, QBasic and DOSBox are a free download.

xCode Command-Line Tools
Install xCode Command-Line Tools before starting QB64. xCode can be downloaded and installed via the Mac's Terminal App.
In Terminal type: xcode-select --install

QB64 Download
www.qb64.com

QBasic 1.1
QBasic 1.1 is found within OldDOS.exe.

OldDOS can also be found at www.pcxt-micro.com/download.html

DOSBox
QBasic 1.1 needs DOSBox to run on Windows Vista and greater, Mac, and Linux.
DOSBox is a free download at www.dosbox.com