*CP/M* option from the *More... submenu* in the *NextZXOS Startup Menu*, or type **.cpm** in the *NextBASIC Editor* or the *Command Line* will take you straight into *CP/M* *(Fig. 29).*  ``` CP/M Plus COPYRIGHT 1998, CALDERA, INC. 101198 CP/M Plus BIOS (v0.91) for ZX Spectrum Next (c) 2019, Garry Lancaster 60.5K TPA A> ``` *Fig. 29 – ZX Spectrum Next properly booted CP/M setup* ### Commands *CP/M* is operated by typing commands at the prompt (**A>**). One of the most useful commands is **DIR** which works much in the same way that **CAT** works in *NextZXOS*. Typing: ``` DIR A: ``` will show a list of all the files on the current drive or the drive specified. Initially you will just have drive **A:** available, but more can be set up (drives **A:** to **P:** can be used) using the **.mkdata** *dot command* in *NextZXOS* as per the instructions provided earlier, so that you can keep different programs on different drives. Any filename shown by **DIR** which ends in **.COM** is itself a command, and can be executed at the prompt. You will have noticed there are a lot of **.COM** files to try. Another useful one is: ``` HELP.COM ``` which provides help and information on all the standard commands and utilities provided with *CP/M*. Note, that you do not need to type the .COM part all the time; CP/M will find the appropriate command and executed without having to type its extension (in other words its file type). So to call up **HELP.COM** you could just type: ``` HELP ``` Commands are also case-insensitive, so it doesn't matter if you type them in lower or upper case or a mix of both; all versions of **HELP**, **help**, **hELP** and **HelP** will call the exact same program! In the *CP/M* distribution that comes with *NextZXOS*, there are a number of commands specific to the ZX Spectrum Next. These include: | Command | Description | |---|---| | **UPGRADE** | Upgrades your installation of CP/M from the latest version available on your SD card | | **TERMINFO** | An interactive demonstration of the terminal facilities provided on the ZX Spectrum Next | | **EXIT** | Exits from CP/M and returns to NextZXOS |