The Apple I computer had a few notable features. One was the use of a TV as the display system, whereas many machines had no display at all. This was not like the displays of later machines, however; the text was displayed at 60 characters per second. However, this was still faster than the teleprinters used on contemporary machines of that era. The Apple I also included bootstrap code on ROM, which made it easier to start up. Finally, at the insistence of Paul Terrell, Wozniak also designed a cassette interface for loading and saving programs, at the then-rapid pace of 1200 bit/s. Although the machine was fairly simple, it was nevertheless a masterpiece of design, using far fewer parts than anything in its class, and quickly earning Wozniak a reputation as a master designer.