How to tell the difference between the MICROS Workstation 4 (WS4) and the MICROS Workstation 5 or 5A (WS5/WS5A):

The Workstation 4 Series Has a Rectangular Light on the Bottom Right Hand Corner.

It also has a "flat" credit card reader on the right that is built into the base:

WS4.png

 

The Workstation 5 or 5A Has a Circular Light on the Bottom Right Hand Corner.

The credit card reader protrudes from the right side:

Micros-Workstation-5-System-Unit-400814-001-Touch-Screen.jpg

 

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