Years ago I used these things every day, and I have several to sell. These look brand new. I'm not sure they've been used at all.
These were built by Spectrum Digital right here in Texas, so the quality is amazing. I've used these things for years and years and never saw one fail.
You connect the JTAG to any TI processor and you're free to reset, look into memory, write memory, single step, etc.!
Satisfaction guaranteed!