The System 3 moved on by adding floppy disk support, and the System 4 by including a larger case with a second drive. The System 5 was largely similar to the System 4, but included a newer 2 MHz version of the 6502.
The System 3 moved on by adding floppy disk support, and the System 4 by including a larger case with a second drive. The System 5 was largely similar to the System 4, but included a newer 2 MHz version of the 6502.