Need a debugger for Dos Assembly

I'm trying badly to track down a debugger for DOS assembly, it's really hard to debug this code and I n开发者_如何学Ceed a debugger. Does anyone out there know where I can download any version of turbo debugger?

The OpenWatcom project contains a very good debugger, which exists in both 16 bits and 32 bits versions for DOS (32bits through several so-called DOS extenders), Windows and OS/2. Have a look at the documentation here

Also check IDAPro, a combined disassembler-debugger. A free version is available here

The place you can download legal version of old borland tools is here:

http://edn.embarcadero.com/museum