It's a TRS-80 Model 4P, rather than 4 lines of horizontal resolution. Fourth version, and P means portable (in the loosest sense of the term). The actual video

It's a TRS-80 Model 4P, rather than 4 lines of horizontal resolution. Fourth version, and P means portable (in the loosest sense of the term). The actual video would be 16 characters high by 64 characters wide.