Define PnP POST

PnP POST is the part of the power-on self-test (POST) of a Plug and Play BIOS that detects and configures PnP devices at start-up. After the basic POST checks of CPU, memory and the boot devices, the PnP BIOS isolates every PnP card on the ISA bus and gives each a card select number (CSN), reads its resource requirements, resolves conflicts with the legacy devices recorded in the ESCD, assigns IRQ, DMA, I/O and memory resources, activates the cards, and then continues to boot the operating system.