16 MHz. Some software also has problems running at faster speeds. To make the system work with a 32 MHz 68030, Atari Corp. had to scale back their plans somewhat, and add a large amount of cache to the system. As a result, the processor runs at 32 MHz, while the system bus runs at 16 MHz. This is similar to the tactic employed by Apple with the ill-fated Macintosh IIvx and later employed by makers of PCs with an Intel 80486DX2 CPU which runs at double that of the system bus speed. TOS 3.01 is the operating system that Atari bundled with the TT. It is a 512 KB ROM specifically designed for the TT. However, it does not feature pre-emptive multitasking. Another variant, known as TT/X, uses Unix System V R4 and WISH (Motif extension). The TT030 was first introduced at CeBIT in Hannover, Germany and launched in 1990. It retailed for $2995 with 2 MB RAM and a 50 MB hard drive. The US release came the following year. In 1993, Atari Corp.'s exit from the computer business marked the end of the TT, as well as the entire ST family. A number of TT machines were built as developer systems for the Jaguar. Details The TT features a number of devices that had previously been unavailable for Atari Corp. systems. For example, an AppleTalk network port (there never was a driver for it, possibly due to license problems), VME expansion bus, new VGA video graphics modes, and a true SCSI port. Existing ST features such as MIDI ports, a cartridge port, and the ASCI/DMA port are retained in this system. One device that is left out is the BLiTTER graphics chip, which first appeared in the Atari Mega ST systems four to five years earlier. Using the existing 8MHz chip would have only served to bottleneck the TT's performance. To be useful, a new 32MHz blitter chip would have had to have been designed for the TT, however Atari chose not to do so. An Atari Corp. version of Unix System V was not released until mid-1992. By the end of that year, Atari Corp. dropped all Unix development. A special version of the TT, the TT/X, was supplied with UNIX System V R4 and WISH (an extension of OSF Motif), as well as a collection of free software utilities including GCC. In the boot screen