Page 14 - Computer_Science_F5

Activity 1.2:
Simulation of Von Neumann architecture (Data allocation in memory) Chapter One: Computer architecture

Aim: Understanding of how data is allocated and managed in memory
within a Von Neumann architecture.
FOR ONLINE READING ONLY
Materials: Computer, Johnny simulator software, Internet if you don’t have a
simulator
Instructions: Using Johnny simulator, create a program that adds the values of
locations 10 and 11 and stores the result in location 12 to simulate
memory allocation. Then answer the questions that follows.

Step 1: Open the simulator and click on one RAM location to launch the window
where the numerical value can be changed or a macro instruction can be
chosen from a pull-down menu as shown in Figure 1.3.

Figure 1.3: Simulation of data from input to RAM

Table 1.2: Description of the standard (macro) instruction set used in the simulator
Instruction set Description

TAKE The value of the location (given by the absolute address) is
transported to the accumulator.
SAVE The value of the accumulator is transported to the location given by
the absolute address.

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Student’s Book Form Five

Computer Science Form 5.indd 5 23/07/2024 12:32