Editing Zilog Z80000 (section)

==Description==
Like the Z8000 it is based on, the Z80000 has sixteen general-purpose [[processor register|registers]], but expanded from the Z8000's 16-bit to 32-bit. Like the Z8000, the Z80000 allows its registers to be combined, in this case using two 32-bit registers to act as a single 64-bit one. To support the Z8000s 16-bit wide data, the Z80000 can place two 16-bit values in a single 32-register.

The processor includes a [[memory management unit]] that provides [[protected memory]], important for [[computer multitasking|multitasking]], and [[virtual memory]] addressing for temporary storage of RAM on a [[hard disk]]. The processor has three methods of accessing memory:

* compact mode&nbsp;– meant for small programs, could only access 64&nbsp;KB (16-bit addresses, equivalent to the Z8000's non-segmented mode).  Address bits 31-16 of all virtual addresses comes from address bits 31-16 of the program counter.
* segmented mode&nbsp;– 32,768 segments of 64&nbsp;KB (16-bit address; comprising memory from 0-2GB) ''and'' 128 segments of 16&nbsp;MB (24-bit address; comprising memory from 2GB-4GB), making a total of 4&nbsp;GB (32-bit address) of accessible memory.
* linear mode&nbsp;– direct 4&nbsp;GB (32-bit address) accessible memory

On the Z80000 CPU, [[interrupt|interrupts]] are part of a category known as exceptions. This category includes resets, bus errors, interrupts, and traps.<ref>{{cite web |url=http://bitsavers.trailing-edge.com/components/zilog/z80000/Z80000_CPU_Preliminary_Technical_Manual_Sep84.pdf#page=12 |page=12(1-3) |title=Z80,OOOTM CPU Preliminary Technical Manual September 1984 |accessdate=2023-12-08}}</ref>

The processor is designed to interoperate with other [[integrated circuit]]s designed for use with the Z8000, such as the [[Zilog Z8070]] [[floating-point]] [[coprocessor]].

The Z320 was the [[CMOS]] version of the Z80000.