!! Industry Standard Architecture

An expansion card standard for adding core components and extra peripherals to PCs. Old as the hills, something like 20+ years. Available initialy in 8-bit form on the very first x86 based PCs, and then 16-bit form on 286 and later machines. Even implemented by some manufacturers on sixth and seventh generation x86 motherboards.

Rendered obselete by [PCI], but will die a slow an painful death, simply because it has been around for so long.