The original plans for the TT were designed around the 68020. The 68020 still lacked certain important features offered by the next successor in the 68000 line, the new 68030. When the decision was made to switch the system from a 68020 to a 68030, this presented a whole new set of problems. The original specifications called for the TT to run at 16MHz. The 16MHz speed was selected to maintain backward compatibility.
Some software also has problems running at faster speeds.
To make the system work with a 32MHz 68030, Atari had to scale back their plans somewhat, and add a ton of cache to the system. As a result, the processor runs at 32MHz, and the system bus runs at 16MHz. The TT featured a number of devices that had previously been unavailable for Atari systems. For example, an Appletalk network port, VME expansion bus, new VGA video graphics modes, and a true SCSI port. One device that was left out was the Blitter graphics chip, which first appeared in the MEGA ST systems four to five years earlier.