CPU
Central Processing Unit (CPU)
CPU stands for Central Processing Unit, and refers to the main computational processor in use on a given computer system The CPU's used in all Atari TOS Family were variations of the 68000 family and is commonly written as 680x0 where the x is one of the numbers that mark the class of the CPU.
MC68000
The Atari ST series of computer uses the 16 bits Motorola 68000 CPU. Variant of the CPU can be found here.
MC68030
The Atari Falcon030 and Atari TT030 computers uses the 32 bits Motorola 68030 CPU. Variant of the CPU can be found here.
MC68040
MC68060
Some hardware CPU accelerator uses this type of 32 bits CPU. Variant of the CPU can be found here.
Coldfire
The ColdFire is a microprocessor that derives from the Motorola 68000 family architecture, manufactured for embedded systems development by Freescale Semiconductor (formerly the semiconductor sector of Motorola). More information here.