York was also part of a team developing the next generation portable computer. The Arc Mouse is a family of portable computer mice produced by Microsoft. The SX-64 has the distinction of being the first "full-color" portable computer. Another early portable computer released in 1982 was the Kaypro. The Xerox NoteTaker is an early portable computer. LapStar was a cut-down clone for the TRS-80 Model 100 portable computer. The IBM 5110 Computing System is the successor of the IBM 5100 Portable Computer. At Osborne, he was the designer of the Osborne 1, the first mass-produced portable computer. He introduced the Osborne 1, the first commercially successful portable computer. Steve announced the new consumer portable computer, the iBook. The development of the laptop form factor gave new impetus to portable computer development. Sharp used bubble memory in their PC 5000 series, a laptop-like portable computer from 1983. This was to be a portable computer with an integral flat-screen CRT display. The TRS-80 Model 100 is a portable computer introduced in 1983. Apple released their first portable computer, the Macintosh Portable in 1989.