tion to change how many columns are displayed by either again calling up the *NextZXOS menu* with **EDIT** and selecting the *32/64/85* entry or by directly giving the **SPECTRUM CHR$** command that can change the columns displayed immediately. See the **SPECTRUM CHR$** entry previously in this chapter for details of usage. > **Notes** > > ⚠ > > WARNING! WARNING! WARNING! WARNING! WARNING!\ > **Disabled Expansion Bus** refers to **disabled SIGNALS** on the Expansion Bus. The\ > Expansion Bus is **CONSTANTLY UNDER POWER** and you must **ALWAYS PLUG**\ > **Interfaces and ROM cartridges** with **ALL CABLES DISCONNECTED** otherwise\ > IRREPARABLE DAMAGE MAY OCCUR!!!!\ > WARNING! WARNING! WARNING! WARNING! WARNING! ### ROM Cartridge Loaders For users of ZX Interface 2, Ram Turbo, Dandanator and compatibles, *NextZXOS* introduces the ability to load ROM cartridge based software directly from the *More… submenu* and selecting the *Interface 2* option. Since the ZX Spectrum Next starts with the expansion bus disabled, it provides a quick way to type the appropriate commands to load either 48K or 128K ROM based software as well as apply all necessary settings to ensure maximum compatibility of cartridge based software. All you have to do is select the appropriate option. *NextZXOS*, will make the necessary adjustments, enable the bus and load the software. #### 48K BASIC The *48K BASIC menu*, located in the *More… submenu*, turns your ZX Spectrum Next to into a standard 1982 ZX Spectrum… with a twist! First of all, according to the Next personality you have selected during boot, you may have full key entry (*Looking Glass*) instead of token (i.e. the keywords you see printed on your ZX Spectrum Next's keyboard) single-key entry (ZX Standard). Additionally, you have access to all the ZX Spectrum Next's additional features although not from BASIC. Finally you have access to your SD card via the *dot commands* we've already discussed. You can also reach 48K BASIC using the **SPECTRUM** command as discussed in a previous section. #### 128K BASIC The *128K BASIC menu*, located in the *More… submenu*, turns your ZX Spectrum Next to into a 1985 ZX Spectrum 128K with the extra hardware of the Next available but unlike the 48K option discussed above, the dot commands do not work as esxDOS requires a 48K BASIC (the so called USR 0 mode). #### ZX80 and ZX81 BASIC This is a convenient way to access the ZX80 and ZX81 emulators by Paul Farrow without having to launch a separate personality on boot. There's no way other than reset to come back from the ZX80/81 emulators. ### NMI Menu While in Next mode, pressing the **NMI** button will launch the *NMI menu* which provides a lot of useful functionality to your ZX Spectrum Next. The *NMI menu* traces its lineage back to an expansion interface called *Multiface*. Multiface, allowed users to pause a program and *break into it*, create snapshots of the system's memory which upon reload, placed the machine in the same place they were (and running the specific program they were) at the point in time they were, when they saved each snapshot. The *NextZXOS NMI menu* offers, however, many more features over those of the original Multiface. We'll examine the most important ones of these below.