ECP : Computer Hardware Buyers’ Glossary
ECP (Enhanced Capacity Port). A faster bi-directional parallel port. This allows
the printer to interrogate the printer. A normal parallel port only allows the
computer to send information to the printer, not the reverse, except for few bits of
printer status. The bi-di port can also be used by LapLink to tie two computers back
to back. An ECP port uses a DMA (Direct Memory Access)
channel which allows you to efficiently send information to a printer without
pestering the CPU (Central Processing Unit) with an interrupt for every character sent.