 There were also DOS device drivers such as ox.sys, which implemented a serial interface simulation on the monochrome display and, for example, allowed the user to receive crash messages from debugging versions of Windows without using an actual serial terminal.It is also possible to use the "MODE MONO" command at the DOS prompt to redirect the output to the monochrome display.When a monochrome adapter was not present, it was possible to use the 0xB000–0xB7FF address space as additional memory for other programs (for example by adding the line "DEVICE=EMM386.EXE I=B000-B7FF" into config.sys, this memory would be made available to programs that can be "loaded high", that is loaded into high memory.)