http://www.bb-elec.com/tech_articles/parallel_port_explained.asp
" Two new types of parallel ports with extended features are now
available:
the Enhanced Parallel Port (EPP) and the Extended Capabilities Port (ECP).
EPP and ECP are standards defined by IEEE 1284 and Microsoft ECP
Specifications. Both EPP and ECP ports may be operated in the SPP and
bi-directional modes; however, operation in their feature modes requires
both compatible peripherals and appropriate software drivers. This paper
is
intended to explain just some of the major differences of the ECP and EPP
modes.
Generally, EPP is used primarily by non-printer peripherals, CD ROM, tape
drive, hard drive, network adapters, etc., while ECP is aimed at newer
generation of printers and scanners. Currently, new products have been
released having support for a mixture of these protocols. The following
table shows some devices and their particular protocols supported. You may
need to consult your device specification for the exact protocols
supported
by your product(s)."