and the Z-80 becomes a slave processor responsible for all input/output (I/O) operations including disk, communication, printer, and network, keyboard, and integrated monitor, while the operating system and applications run on the 68000 CPU. The Z-80 can be used to do other tasks.

The earlier TRS-80 Model II, released in 1979, is also a multiprocessor system as it has both a Z-80 CPU and an Intel 8021 microcontroller in the keyboard. The 8021 made the Model