Unity 8 Bit Computer Simulator by MichaelGaidas - 1

Simulators

An 8-bit computer simulator built in Unity

Unity 2019.3.13f1Unknown LicenseUpdated 36 days agoCreated on August 12th, 2020
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Unity_8BitComputerSimulator

An 8-bit computer simulator built in Unity that shows how components of a computer actually work.

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Installation (for Unity Editor)

Clone or download the repository

Open UnityHub, click add, and select Unity_8BitComputerSimulator-master

Installation (for Standalone Windows Build)

Download Unity_8BitComputerSimulator/8BitSimulator_Builds.zip

Open and unzip 8BitSimulator_Builds and double-click 8BitComputerSimulator.exe

Usage

Show Code Button -> Pops up code text box for writing

Delay Speed Slider -> The delay per operation in seconds

Show Log Button -> Pops up a log of all of the operations of the overall computer

Start Program Button -> Start/Reset the program

Hover over any component to see what it is via your mouse

Components colored Cyan are in use for the current operation

Examples

LDI 3
STA 14
ADD 14

This does an immediate load (LDI) into the A register, stores the contents of the A register into memory address 14, and finally adds the contents of memory address 14 to the A register. The final result is 6 which is showed in the A register and O (output) register.

Note: the output register is not always utilized, typically only when the B register is needed for ALU operations.

Opcodes

LDA - 0001 XXXX - loads the contents from XXXX into the A register, where XXXX is the memory address location
ADD - 0010 XXXX - adds the contents of XXXX to the A register, where XXXX is the memory address location
SUB - 0011 XXXX - subtracts the contents of XXXX to the A register, where XXXX is the memory address location
STA - 0100 XXXX - stores the contents of the A register into the memory address XXXX
LDI - 0101 XXXX - does an immediate load of the value XXXX to the A register
JMP - 0110 XXXX - jumps the program counter to XXXX - NOTE: do not use this, conditionals have not been setup yet

Notes

I suggest having an understanding of how the individual components of a computer work. This should be used to aid that process or experiment with low level operations. Trying out some basic programs, having a large delay time, and checking each operation via the log will seriously help your understanding. Also, I suggest hovering over the components to see what is what and to get familiar with the scene.

References

Ben Eater is awesome. If you have any questions or confusions I strongly suggest watching his series on building an 8-bit computer. This is how I was able to implement the computer in Unity along with previous experience from school.

Link: https://www.youtube.com/watch?v=HyznrdDSSGM&list=PLowKtXNTBypGqImE405J2565dvjafglHU

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