The Silent 700, introduced in 1971,[1] was a line of portable computer
terminals manufactured by Texas Instruments in the 1970s and 1980s.
Silent 700s printed with a 5 x 7[2] dot-matrix heating element onto a
roll of heat-sensitive paper. Some models were equipped with an
integrated acoustic coupler and modem that could receive data at 30
characters per second. Other models could be directly connected to
computers at 300 bits per second (bit/s), and were sometimes used as the
System console where a hard copy record of the activities would be
retained for a period of time. 

The Model 745 was introduced late 1975 as "the lightest-weight portable
now available."[2][4]