overlay

The keyboard overlay can be a memory jogger and a great help with spelling. In this way the keyboard makes word processing more accessible to younger as well as special needs children.

This concept can be extended further by allowing a primary overlay to call a secondary overlay, and so on. However, we will limit ourselves here to the use of primary overlays. Before proceeding further, you need to understand the memory map of the computer, which is a diagram showing the use to which the memory of the computer is put.

The first, on January 1, 1883, was attributed to the overlay becoming surcharged with water, due to insufficient drainage, and causing a slip.