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Emulation of a Calculator Tape Log on a Computer Display Screen

IP.com Disclosure Number: IPCOM000060941D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Lin, C: AUTHOR [+2]

Abstract

A method is described to permit a Personal Computer to record the activities of a calculator and to allow the user to review and print the activities at any point in time. A Tape Log table is provided to record the operations entered by the Personal Computer user. The Tape Log table holds up to 100 entries. The Tape Log table is a sequenced list of records that record all the activities on the calculator. Each record has the format (operator number) where the format of the number is (integer.fraction). All mathematical numbers on the tape log are decimal point aligned. The operator is either calculator operator (+,-,*,/,%,=) or memory operator (M+,M-,CM or RM). The number is less than 99999999.5 and greater than -99999999.5.

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Emulation of a Calculator Tape Log on a Computer Display Screen

A method is described to permit a Personal Computer to record the activities of a calculator and to allow the user to review and print the activities at any point in time. A Tape Log table is provided to record the operations entered by the Personal Computer user. The Tape Log table holds up to 100 entries. The Tape Log table is a sequenced list of records that record all the activities on the calculator. Each record has the format (operator number) where the format of the number is (integer.fraction). All mathematical numbers on the tape log are decimal point aligned. The operator is either calculator operator (+,-,*,/,%,=) or memory operator (M+,M-,CM or RM). The number is less than 99999999.5 and greater than -99999999.5. New tape log records scroll the screen up one line and are added to the bottom of the tape log to create the effect of a standard adding machine tape log. The user may scroll up or down through the tape log window displayed on the screen by using the cursor up/down or page up/down keys. In addition, the user may print the tape log or clear the tape log by pressing the specified function key. An example of the tape log window with the following calculations is shown below. 2.17 + 3.14 * 4 = (simple chain calculation) M+ (save results in memory) 100 / RM = (divide 100 by memory)

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