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Browse Prior Art Database

Terminal Replacement Box

IP.com Disclosure Number: IPCOM000108695D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Gorga, KJ: AUTHOR

Abstract

In order to test computer systems, it is necessary to attach a large number of terminals in order to simulate multiple users. The trend of increasing the number of users that can be attached to a computer system has caused a large increase in the number of terminals needed for testing. Installing all of these terminals is expensive and re quires a large amount of space, power, and cooling. The Terminal Replacement Box places the actual terminal motherboard electronics in a card cage with 7 other boards and has a single power supply, keyboard and CRT display. This saves cost, space, power, and cooling by eliminating 7 other keyboards, displays, and power supplies. This provides complete compatibility since the actual terminal motherboard is used rather than an emulator.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Terminal Replacement Box

       In order to test computer systems, it is necessary to
attach a large number of terminals in order to simulate multiple
users.  The trend of increasing the number of users that can be
attached to a computer system has caused a large increase in the
number of terminals needed for testing.  Installing all of these
terminals is expensive and re quires a large amount of space, power,
and cooling.  The Terminal Replacement Box places the actual terminal
motherboard electronics in a card cage with 7 other boards and has a
single power supply, keyboard and CRT display. This saves cost,
space, power, and cooling by eliminating 7 other keyboards, displays,
and power supplies.  This provides complete compatibility since the
actual terminal motherboard is used rather than an emulator.  The
multiplexing is not a problem since the keyboards are seldom used at
all and the displays are used only as a visual indication that things
are operating.

                            (Image Omitted)

      The Terminal Replacement Box consists of a card cage with B
terminal motherboards, multiplexing and control logic, a
microcontroller, and a power supply.  The video and sync outputs of
the 8 terminal motherboards are multiplexed to the CRT display to
allow a 1 of 8 selection to be displayed.  The video output can also
be blanked to eliminate flicker and roll when the display is being
switched.  The keyboard is also multiplex...