[header] How to choose a restaurant point of sale system [title] Don't even think about hardware. [step] Historically, a hardware dependent pos forced you to take whatever hardware you had or needed to buy into consideration. This is an obsolete way of making software decisions. 
With affordable bandwidth flowing around the world, there's no need to take on the responsibility of buying servers and maintaining them. Run your software as a cloud service and let someone else handle the computing.