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Evaluate Expression Type Calculator on the Display Terminal

IP.com Disclosure Number: IPCOM000105722D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Inagaki, T: AUTHOR [+2]

Abstract

Disclosed is a calculator function on the display terminal, attached to the host computer, which enables an operator to do arithmetic calculations without disrupting the on-line operation. Aside from the ordinary on-line screen, this function reserves one additional row on the screen. In this row, an operator writes arithmetic expressions to be evaluated and gets answers to these expressions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 68% of the total text.

Evaluate Expression Type Calculator on the Display Terminal

      Disclosed is a calculator function on the display terminal,
attached to the host computer, which enables an operator to  do
arithmetic calculations without disrupting the on-line operation.
Aside from the ordinary on-line screen, this function reserves one
additional row on the screen.  In this row, an operator writes
arithmetic expressions to be evaluated and gets answers to these
expressions.

      As shown in the figure, this function has one row on the screen
area which does not hide any part of the  on-line screen area.  This
row is composed of three parts.  The first part is the
"Expression-area", the second part is the "Answer-area" and the last
part is the "Information-area".

      In the "Expression-area", a cursor moves freely and an operator
can input arithmetic expressions in the same manner as normal on-line
operation.  The "Answer-area" displays an evaluated value for an
expression.  The "Information-area"  indicates other necessary
information when an operator is using a calculator.

      The procedure is as follows:

1.  An operator inputs a arithmetic expression in the "Expression
    -area" by typing keys or copying numbers from another part of the
    screen or recalling memory contents.
2.  The calculation program runs in the following way.
3.  The calculator reads the expression and stores necessary values
    in the registers of the calculator, and t...