Browse Prior Art Database

Multifunction I/O Cards

IP.com Disclosure Number: IPCOM000107751D
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 3 page(s) / 104K

Publishing Venue

IBM

Related People

Colombo, C: AUTHOR

Abstract

Disclosed are two electronic cards that allow a complete remote control of some printers, for example, the IBM laser printer 4019.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Multifunction I/O Cards

       Disclosed are two electronic cards that allow a complete
remote control of some printers, for example, the IBM laser printer
4019.

      The IBM 4019 laser printer, such as all other printers driven
by parallel interface, does not send its detailed status to the
master PS/2*. All the information about the printer status and the
operator panel command are not directly available to the personal
computer, so it is impossible to automatically handle the printer
options. This means, in case of a problem, that the printer must be
restored by the operator.

      The cards described below can simultaneously monitor the
printer status and drive all the commands available to the operator
panel without human intervention.

      Multifunction I/O cards, that are a PS/2 attachment (two
versions: MCA, AT* bus), can capture the 4019 status data from the
serial connection linking the printer CPU to the operator panel. This
information, formatted in frames of 35 bits, is decoded by the card's
electrical circuits and converted in five bytes that are mapped in
PS/2 I/O space.

      Multifunction I/O cards drive the five switches mounted on the
printer operator panel using five optoisolated lines. This output can
be driven using simple PS/2 I/O commands.

      These attachments are also equipped with an LPT2 port so that
they make possible to implement stand-alone stations, made by a PS/2
plus an IBM 4019, able to print complex document, manage printer
options, and control itself. These capabilities are important when
unattended printer applications are required, such as automatic
document distributors.

      Multifunction I/O cards have been designed for the IBM 4019
laser printer, but it is possible to interface other printers that
use the same type of data handshaking between CPU and operator panel.
The card logic, based on Programmable Array Logic (PAL) circuitry,
can be easily changed to interface other types of serial
communication.

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