What is the Zorro Pattern?

The ZORRO Pattern:

When you want to load a new overlay into an area that already has an overlay, you are asked to enter the Zorro pattern. The Zorro pattern tells the Device to erase the current User Area and get it ready for a new overlay. To perform the Zorro pattern, activate the following keys in the order they are given:

A1, P1, A8, P8, A8, P1, A1.

The pattern traces a "Z" across the keyboard.