Atari Commodore 64 Amiga Joystick Tester

Hi I have tested it with my C64 and Amiga. You can use the coin battery without connecting your computer.

Paddles can be tested individually once the adapter is connected to the amiga port for example. Using AmigaTestKit and selecting F4 Controller Ports, there is an option for analogue controllers.

Sorry, I didn't specify I was using Atari type paddles and a 3v battery to power tester. I do not have an Amiga to test with. Would connecting the device to an Atari console work? I never added the plug to connect to port but I have some and it wouldn't take much. How do the jumper pins next to the selection switch work?

Commodore and Atari have virtually the same hardware at the control ports. However I have experience with Amiga only. I can image how an Atari computer works. The schematic can help you to better figure out how it works. If you connect the paddles to the machine using the tester, you need to switch the battery OFF (move the switch to "Computer" side) first of all. Fire1 and 2 slide switches go to the "Paddle A" and "Paddle B" positions. Make all the changes and connections with the machine in OFF state. You should have some test utility to let you read the analogue-to-digital converted values from each X and Y axis.

the header connectors of Paddle A and B are used to plug linear potentiometers (not necessarily a physical paddle) for testing ADC inside the Amiga. sometimes paddles are OK, but internally the machine has a faulty ADC. It can help troubleshooting the system.

Here is what happens when I connect the tester between Atari paddles and an Atari console. I have no test utility so just recorded my observations based on LEDs. When 'fire 1' switch is to 'paddle a', right LED lights up when button pressed on 'player 1 paddle'. When 'fire 2' switch is to 'paddle b', left LED lights up when button pressed on 'player 2 paddle'. Turning either paddle produces no results. When 'fire 1' switch is to 'fire 1' turning 'player 1 paddle' lights up 'fire 2' LED. Full clockwise - LED is off. Full counter-clockwise - LED is full bright. There is a small section of paddle movement just off full clockwise when the LED goes from off to full bright, like a dimmer switch for a lamp. The same happens when 'fire 2' switch is to 'fire 2'. The 'player 2 paddle' lights up 'fire 1' LED. For my purposes the tester works well and I enjoyed building it. Thank you for sharing the design and taking the additional time to explain how the functions work.

Actually no it cannot. It is designed for Atari D-SUB9 pin out. It is compatible with Commodore, Amiga and Atari. The Mega Drive controller shown in the photo is modified to connect the Amiga standard port.