Portable Dot Matrix Printer

Dot matrix printers printed pages similar to a typewriter in that they had a print head that ran back and forth across the page. They differentiated from typewriters, because they created text with tiny dots, hence the name dot matrix.

This particular printer was portable and worked with early Apple PowerBooks.

References: http://en.wikipedia.org/wiki/Dot_matrix_printer

Portable Dot Matrix Printer
Portable Dot Matrix Printer