Z80 based. Laptops which could run the CP/M operating system just like the desktop machines followed with Epson PX-8 Geneva in 1984, and in 1985 the Epson PX-4 and Bondwell-2. While the laptop market in subsequent years moved to more powerful Intel 8086 processors and the MS-DOS operating system, light-weight Z80-based systems with a longer battery life were still being introduced, such as the Cambridge Z88 in 1988 and the Amstrad NC100 in 1992. The Z80-derived Z8S180 also found its way into an early pen-operated personal digital assistant, the Amstrad PenPad PDA600 in 1993. Hong Kong-based VTech produced a line of small laptop computers called 'Lasers' based on a Z80. The last two were the Laser PC5 and PC6. The Cidco MailStation Mivo 100, first released in 1999, was a stand-alone portable email device, with a Z80-based microcontroller. Texas Instruments produced a line of pocket organizers (ending in 2000) using Toshiba processors built around a Z80 core; the first of these was the TI PS-6200 and after a lengthy production run of some dozen models culminated in their PocketMate series. Embedded systems and consumer electronics The Zilog Z80 has long been a popular microprocessor in embedded systems and microcontroller cores, where it remains in widespread use today. Applications of the Z80 include uses in consumer electronics, industrial products, and electronic musical instruments. For example, Z80 was used in the groundbreaking music synthesizer Prophet-5, as well as in the first MIDI synthesizer Prophet 600. Casio used the Z80A in its PV-1000 video game console. A good number of early-1980s arcade video games, including the arcade game Pac-Man, contain Z80 CPUs. The Z80 was used in the Sega Master System and Sega Game Gear consoles. The Sega Genesis contains a Z80, with its own 8 KB of RAM, which runs in parallel with the MC68000 main CPU, has direct access to the system's sound chips and I/O (controller) ports, and has a switched data path to the main memory bus of the 68000 (providing access to the 64 KB main RAM, the software cartridge, and the whole video chip); in addition to providing backward compatibility with Master System games, the Z80 is often used to control and play back audio in Genesis software. Z80 CPUs were also used in the trailblazing and popular TI-8x series of graphing calculators from Texas Instruments, beginning in 1990 with the TI-81, which features a Z80 clocked