Insight worked well for me.
http://www.bttr-software.de/products/insight/
Description
Insight is a very small debugger for analyzing real-mode DOS programs. It features an i80486 disassembler, an i8086 assembler, 'Trace into' and 'Step over' functions, simple breakpoint handling, extended code or data navigation, simple color-highlighting, and a nice menu-driven interface comparable to Borland's Turbo Debugger.
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