Portable information terminal mountable on shopping cart and removable memory device usable with same

A system comprising a portable information terminal mountable on a shopping cart for providing product and advertising information while the cart is moved inside a store and an external memory device connectable to the portable information terminal,

• the external memory device comprising:
• a memory housing;
• a non-volatile memory storing data in the memory housing;
• a first electrical connector projecting from the housing for allowing a processor to access the stored data;
• and
• a key member projecting into the memory housing farther than the first electrical connector for actuating a release mechanism of at least one door of the portable terminal;
• the portable terminal comprising:
• a terminal housing including a display;
• a processor in the terminal housing for causing the display to display product information and advertisements;
• a second electrical connector inside the housing complementary to the first electrical connector for connecting an external memory device to the processor;
• the terminal housing including a passage providing access to the second electrical connector from outside the terminal housing, and said at least one door recessed in said passage shiftable from a first position blocking said passage to a second position by inserting the external memory device into the passage;
• and
• a latch, slidably mounted on and laterally slidable using said release mechanism with respect to said at least one door and shiftable between a latched position preventing said at least one door from shifting from said first position to said second position and an unlatched position allowing said at least one door to be shifted from said first position to said second position.