Editing Rollover, blocking and ghosting (section)

===A technical explanation of NKRO===

Implementing NKRO involves preventing ghosting from happening on the electrical level, there are two ways in which this can accomplished -

*The keyboard can be built with switches that don't allow current to find its way through unintended paths, such as capacitive or Hall effect switches. 
*Insert diodes along the the switching matrix's columns to ensure that current can only flow in the correct direction.

Both of these were common practice up till the mid eighties, where cost cutting led to blocking becoming the standard way to prevent ghosting.