Before revision: Older types of IC including PPOMs and EPROMs and some early programmable logic was typically programmed through parallel busses that used many of the device's pins and basically required inserting the device in a separate programmer.
After revision: Older types of IC including PROMs and EPROMs and some early programmable logic was typically programmed through parallel busses that used many of the device's pins and basically required inserting the device in a separate programmer.