DOS application that loads a multiboot2-compliant (HelenOS) OS image (using pieces of code that run in 386 protected mode) and starts it.
To compile you need Borland C++ 3.1 IDE (i.e. Borland C compiler and Turbo Assembler). Either use the project file included in the repo, or create a new project and add all the .c and .asm files, compile with small memory model and all the default compilation options.
You need to build HelenOS for ia32. Suggest selecting 486 processor and disabling SMP. You must disable framebuffer, because DOSMBoot does not provide one.
You need to add a kernel.elf file to the directory where DOSMBOOT.EXE is located. You need to create a subdirectory named MODULES and add all the HelenOS boot modules to it.
Default memory size for DosBox 0.76.0 seems to be 16 MB. This is unfortunately not enough to load the entire OS from RAM disk. You need to edit $HOME/.config/dosbox/dosbox-xxx.conf and increase memsize to at least 128.
Mount the directory containing DOSMBOOT, chdir to it and run DOSMBOOT.EXE.
It's a good idea to have mtools package and a Qemu virtual machine with DOS. Prepare a floppy image with dosmboot
$ dd if=/dev/zero of=floppy.img bs=1k count=1440
$ mkfs -t msdos floppy.img
$ mcopy -i floppy.img /path/kernel.elf ::
$ mmd -i floppy.img ::modules
$ mcopy -i floppy.img /path/<module-name> ::modules
$ qemu ... -drive if=floppy,index=0,format=raw,file=floppy.img
C:\> A:
A:\> DOSMBOOT