This software stopped working when HFS read-only support was removed from macOS. But there are excellent alternatives for accessing MPW from a modern computer: https://github.com/elliotnunn/mps https://github.com/ksherlock/mpw ------------------------------------------------------------------------ EMPW (Emulated MPW) = Mini vMac + Macintosh Programmer's Workshop + glue Requirements (install all with brew): - hfsutils - rsync (newer than the one shipping with macOS) - python3 Examples: # Enjoy an interactive MPW session in Mini vMac (kills your battery life!) $ cd my-fancy-source-tree && empw # Run a non-interactive MPW command and capture its standard output. $ empw Help FileSystem # Transfer files to the emulated MPW session. $ echo Hello, world! > TextFile && empw Catenate TextFile