You can use objdump. According to this article the syntax is:
objdump -D -b binary -mi386 -Maddr16,data16 mbr
The GNU tool is called objdump, for example:
objdump -D -b binary -m i8086 <file>
I like ndisasm for this purpose. It comes with the NASM assembler, which is free and open source and included in the package repositories of most linux distros.
ndisasm