It depends on how long before you look. In 1990s they were fairly popular as the smaller devices were expensive and small screens were hard on the users and cus

It depends on how long before you look. In 1990s they were fairly popular as the smaller devices were expensive and small screens were hard on the users and custom development was not as easy, so field data entry was often with some b&w tablet, often connected to a portable printer and other accessories.