Computer Science Illuminated
Computer Science Illuminated
7th Edition
ISBN: 9781284155617
Author: Nell Dale, John Lewis
Publisher: Jones & Bartlett Learning
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Chapter 6, Problem 52E

Explanation of Solution

Button for keyboard input on Pep/9 console:

The Pep/9 simulator contains the “Terminal I/O” button to get the input values from the user while executing the program.

Example program:

Consider the following assembly-language program which is used to perform arithmetic operations on the three input variables “number1”, “number2”, and “number3”.

SymbolMnemonicsOperandComment
 BRMain; Branch around data
number1:.BLOCK2; Set up a two-byte block for number1
number2:.BLOCK2; Set up a two-byte block for number2
number3:.BLOCK2; Set up a two-byte block for number3
result:.BLOCK2; Set up a two-byte block for result
Main:DECInumber1,d; Read and store number1
 DECInumber2,d; Read and store number2
 DECInumber3,d; Read and store number3
 LDAnumber1,d; Load number1 value into the accumulator
 ADDAnumber3,d; Add number3 to accumulator and store output into the accumulator
 SUBAnumber2,d; Subtract number2 from the accumulator and store output into the accumulator
 STAresult,d; Store accumulator value into result
 DECOresult,d; Write result value on the screen
 STOP ; Stop the processing
 ...

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