Building the kernel is currently supported under a MS-DOS compatible operating system. The following tools are required:
- OpenWatcom, v1.9 or newer (wmake and exe2bin)
- JWasm assembler
To build DRBIO.SYS, DRDOS.SYS and COMMAND.COM, invoke
wmake from within their sub-directories. The output files
are written to the BIN directory of the component,
like DRBIO\BIN\DRBIO.SYS.
You may consider using FreeCOM or another
command interpreter like 4DOS or SvarCOM instead of COMMAND.COM.
To install the kernel you may use a custom build of the FreeDOS SYS
command, which is part of the
FreeDOS Kernel repository. A pre-built
binary is provided under the name DRSYS.COM with the binary releases on
this site, along with more detailed installation instructions.