I'm hacking on dosemu/NetBSD, and I would very much like to be able to
disassemble 80x86 code that assumes it's in a 16-bit segment.  gdb
appears to always assume a 32-bit segment when interpreting instructions.
This especially matters for things that use immediate constants whose
size is a function of the default operand size.

Is there a way to coerce gdb into 16-bit disassembly mode?  Is there
some other tool I could use?  (I'd prefer teaching gdb, since that would
let me do live debugging rather than post-mortems).

==John