Psion Organiser II LZ64
Dating from the mid 1980s the Psion Organiser was one of the first pocket computers, this is one of the later models with a 4 line display and 64KB RAM. I had one of the 2 line XP models before this one.
Picture shows the LZ64 with the slide cover down and a comms link plugged into the top port. Alongside are 8k, 64k, 128k Datapaks and the Maths Pack. I also have a Datapak formatter somewhere.
Here is a picture of the LZ64 with a Psion Printer II