Debug firmware chip for the E-mu SP-12. Install this chip in your Emu sp12 to access debug, tuning, and diagnostic routines.
See the Youtube video "How To use the Emu SP-12 Debug Chip" for walkthrough on how to install and use this chip. Information can also be found in chapter 6 of the SP-12 manual.
https://archive.org/details/emu-sp-12-service-manual/mode/2up
