With all due respect to gr8rcall for the links - the BC796 is NOT a DMA scanner, so please don't read this one:
Dynamic Memory Architecture - The RadioReference Wiki
This is a Description of how your scanner processes programming
or it will drive you to put the radio back in the closet! :-) It's for the newer BCD796XLT and BCD396XLT.
BCD996XT / BCD396XT / BC785D / BC780XLT / BC760XLT / BC560XLT / Bearcat 300
Pro-2026 / Pro-2023 / Pro-2
FT-8900R / FT-897 / VX-170 / VX-177 / IC-756 Pro III / Icom IC-V8000 / IC-208H / IC-22A