Browse Prior Art Database

Backup Function for the IBM 4683-2 Point-of-Sale Terminal

IP.com Disclosure Number: IPCOM000099599D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Cates, BA: AUTHOR [+3]

Abstract

A point-of-sale terminal (cash register) may contain a power supply and sufficient logic to allow the attached I/O devices to communicate with a controller. The terminal logic provides only a communication function. The controller provides all the application functions to the I/O devices. Should the controller malfunction or the communications line be broken between the controller and the terminal, the terminal would then become unusable because it cannot perform any function by itself. A "backup" function is added to the terminal allowing it to perform a basic "manual cash register" type of operation. In addition, this function includes security and auditability operations that minimize the exposure to fraud and theft when the terminal operates in a standalone mode.

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

Backup Function for the IBM 4683-2 Point-of-Sale Terminal

       A point-of-sale terminal (cash register) may contain a
power supply and sufficient logic to allow the attached I/O devices
to communicate with a controller.  The terminal logic provides only a
communication function.  The controller provides all the application
functions to the I/O devices.  Should the controller malfunction or
the communications line be broken between the controller and the
terminal, the terminal would then become unusable because it cannot
perform any function by itself.  A "backup" function is added to the
terminal allowing it to perform a basic "manual cash register" type
of operation.  In addition, this function includes security and
auditability operations that minimize the exposure to fraud and theft
when the terminal operates in a standalone mode.  This backup
function will not activate unless enabled and the security (managers)
key is "on."

      With reference to the figure, the main processor unit of the
terminal handles the communications with the controller (not shown).
This processor provides no "innate" intelligence within this
terminal.  All decision making is performed upstream from the
terminal in the attached controller.  The main processor just
controls the data path between the I/O devices and the controller.

      In order to provide the backup function, a backup processor
with backup software is added.  In this backup processor, the
transmit line is tied to the receive line coming from the "outboard"
transceiver output a...