The Z380 is a Zilog 16/32-bit processor from 1994. It's Z80 compatible, but it was released much later than its competitors (the Intel 386 and Motorola 68000) and as a result was never able to gain any significant market leverage. On the other hand, the newer and faster eZ80 family has been more successful recently.
The chip supports 16-bit processing with a clock speed of up to 20MHz.
As it stems from the Z180 design, it's a simpler, less efficient design and incompatible with Zilog's previous generation, the Z280, with a lot less features:
- No pipeline
- No memory protection
- Lacks the I/O trap feature
- No built-in cache
- Much simpler MMU
- Minimal of 4 clocks/instruction, against 1 (cache hit) or 2 (cache miss) on the Z280.