Browse Prior Art Database

Downward Compatible Parallel Port Cable with Data Parity Feature

IP.com Disclosure Number: IPCOM000104512D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Booth, JR: AUTHOR [+3]

Abstract

Disclosed is an attachment cable, to extend between a parallel port of a system and a peripheral device, in which an additional line is provided for a data parity signal by using one of the ground pins of a standard connector at each end of the cable.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Downward Compatible Parallel Port Cable with Data Parity Feature

      Disclosed is an attachment cable, to extend between a parallel
port of a system and a peripheral device, in which an additional line
is provided for a data parity signal by using one of the ground pins
of a standard connector at each end of the cable.

      Each connector of the standard parallel attachment cable has 25
pins, eight of which are tied to electrical ground.  In the new
cable, a line is added for a PP_PARITY signal to detect errors in the
byte-wide (8-bit) data stream, extending between a pin location
previously assigned to the grounding circuit at each end of the
cable.  This new line is driven with the same signal timings and
direction as the 8-bit parallel data lines.

      The new cable can be used to attach devices which do, and which
do not, support this parity function.  Identification of a
parity-capable remote device is made at initialization time, with the
generation and use of the PP_PARITY signal being controlled by a
programmable enable bit.

Disclosed Anonymously.