The HP system board 935503-601 is a motherboard spare part for replacing the system board in supported HP point-of-sale equipment. Its exact MPN identifies this specific board and helps distinguish it from other system board variants.
EET lists compatibility with HP Engage One All-in-One System Model 143, Engage One All-in-One System Model 141, and ElitePOS G1 Retail System Base Model 143. The listed package quantity is one piece.