My dad had an Agenda which had a 5-key chorded keyboard[1]. It was quite cool, you could actually type in your pocket to an extent. [1] https://www.microsoft.c

My dad had an Agenda which had a 5-key chorded keyboard[1]. It was quite cool, you could actually type in your pocket to an extent. [1] https://www.microsoft.com/buxtoncollection/detail.aspx?id=4 https://www.microsoft.com/buxtoncollection/detail.aspx?id=4