D3EMU is a user-friendly symbolic debugger that is essential in developing
DSP32C assembly-language code in the MS-DOS environment.  The DSP program is
executed in hardware either at the full speed of the DSP or in a single-step
mode.  The screen is split into regions which display assembly code,
registers, accumulators, memory and breakpoints. The display is
automatically updated during single-stepping or whenever a breakpoint is
encountered.  D3EMU is compatible with CAC DSP32C products: ISA, STD, PC/104
and Microchannel while running on MS-DOS or in a DOS box under Windows 3.1.
D3BUG is a similar debugger for C-source code.