IEEE 1284-2000

The scope of this revision effort is the same as the original scope for Std1284-1994 with the potential addition of an informational annex to document the register model of common PC implementation of IEEE Std 1284-1994. Std 1284-1994 has over 4 years of implementation experience and is currently found on virtually all new PCs and printers. This implementation experience has raised several issues including 1) conflicting text and timing diagrams, 2) unclear text, 3) errors in component values, 4) lack of clear signalling methods for certain boundary conditions. The purpose of this revision effort is to incorporate this learning into the next revision of IEEE STd 1284. Revision Standard - Inactive-Reserved. A signaling method for asynchronous, fully interlocked, bidirectional parallel communi-cations between hosts and printers or other peripherals is defined. A functional subset of thesignaling method may be implemented on personal computers (PCs) or equivalent parallel porthardware with new software. New electrical interfaces, cabling, and interface hardware thatprovides improved performance while retaining backward compatibility with this subset is detailed.