Fred: On my Xy4 setup with my DOSBox-X app, everything seems to be working as designed: On a Mac, the delete key performs the function of the Backspace key on a Windows machine (which is how the Mac keyboard is designed). It deletes the key to the left of the cursor. That�s what happens in Xy4 on my Mac. On the Mac, Cmd-delete works like Del key on a Windows machine; it deletes the character under the cursor. Again, that�s what happens on Xy4 on my Mac. If this isn�t happening on your system, then something may be interfering with the Mac�s keyboard. Try the same key in different programs.