Hardware Overview

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Overview of System[edit]

The AR81 has been designed to provide an easy to use, and flexible test system for most 8 bit logic boards, and is ideally suited to arcade PCBs based around 8 bit processors, using a maximum of 16 bits for addresses.

There are four sections to the AR81:


1) Unit Under Test, Interface.

This is provided by an Arduino unit, and controls the data and address buses, plus more. It runs an operating system called the A.O.S. which will respond to low level commands. The Arduino handles all the hardware controls and operates continuously.

An 0802 LED display is also linked to the Arduino and this displays Address, data and probe information.


2) The User Interface.

This is the front end and gives the user an easy to use GUI, which by clicking buttons will allow various features and functions to be performed. A Raspberry Pi 3 is the heart of this and it is linked to a 3.5 inch LCD, The Arduino and has USB and HDMI connections.

The Raspberry Pi is loaded with a 16GB memory card containing a custom version of Raspbian O.S. which has the Test software to run the main tester code.


3) The Probe Input.

The probe input is fed into an analogue circuit which allows it to measure and test various signal types, such as Audio, Logic and voltages up to 100VDC. (DO NOT EXCEED 90VDC)

4) Power Supply.

The AR81 has 4 internal supply lines to power all the different sections of hardware. These are all generated from a common 9VDC supply input rated at 1.5 amps. Total current drawn is approx 750mA without any external hardware plugged in.


Further more the AR81 is a system that can be upgraded and added to by simply changing the software when new updates and features become available. Additional hardware features will be coming shortly and future additions will include Eprom programmers and Logic Analysers.

It is hoped that the tester becomes an essential tool for the amateur and professional Arcade Repair technician and as such will allow for faster diagnosis of faults.

Look Inside[edit]

Here is a Look inside the Tester. Its no doubt when you get yours you will want to take the top off, so we did it for you.

Open Front of Tester

Open Top of Tester

Whats in the Box[edit]

Content Coming Soon