CPU Simulator

A simple CPU emulator written in C that executes a basic instruction set.

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Clone the Repository

git clone https://github.com/astanx/CPU_simulator
cd CPU_simulator

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Build

make

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Run

./cpu_simulator

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Input Format

Enter instructions, numbers (prefixed with #), addresses, or registers separated by whitespace. End the program with the END instruction.

Example:

LDM #5
STO 1
OUT
END

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Instruction Set

Data Movement

Instruction	Description
LDM #n	Load number n into ACC.
LDD addr	Load number from memory address addr into ACC.
LDI addr	Load number from the memory address stored at addr (indirect) into ACC.
LDX addr	Load number from memory address addr + IX into ACC.
LDR #n	Load number n into IX.
MOV	Move ACC to IX.
STO addr	Store value of ACC into memory address addr.

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Input / Output

Instruction	Description
IN	Input a character into ACC.
OUT	Output ACC as a character.

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Arithmetic Operations

Instruction	Description
ADD #n / addr	Add number or memory value to ACC.
SUB #n / addr	Subtract number or memory value from ACC.
INC reg	Increment register (IX or ACC).
DEC reg	Decrement register (IX or ACC).

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Branching

Instruction	Description
JMP addr	Jump to address addr.
CMP #n / addr	Compare ACC with number or memory value.
CMI addr	Compare ACC with value at indirect address.
JPE addr	Jump to address addr if comparison is true.
JPN addr	Jump to address addr if comparison is false.

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Control

Instruction	Description
END	End the program.

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Clean Up

To remove compiled files:

make clean