Broken Octave

The short octave (broken octave) was a common device effectively increasing the keyboard compass of smaller instruments, without making them any physically larger.

There is often a moment of confusion when a modern player experiences a short octave for the first time, especially one like this instrument where the bottom two sharps are split to provide a front and back half.

This feature can be found in some of the spinet or harpsichord models.

For sample keyboard, it should be tuned as per below:

Broken Octave

Keys Configuration