The Tandy TRS-80 model PC-3 Pocket Computer is one of the smallest ever. It features programmability using an extended version of BASIC which provides formatted output, two dimensional arrays, variable length strings, program chaining and many other advanced features. Also, as shown in the second picture, it has an optional printer and cassette interface. It has a 52 character QWERTY style keyboard, 24 character LCD display, Powerful BASIC in 24kb ROM, 8-bit CMOS processor, 4.2kb RAM. I have full documentation for both the PC-3 and it's printer/cassette interface so e-mail me if you have any questions or want me to look up anything.