Basic Troubleshooting - Diagnostic Cartridge advanced troubleshooting

The place to visit to learn tips on how to troubleshoot your machine.
User avatar
Posts: 3688
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex

Basic Troubleshooting - Diagnostic Cartridge advanced troubleshooting

Post by rubber_jonnie » Fri Jan 08, 2021 11:22 am

For those of you who have the Atari diagnostics cartridge, you will have realised that there are some options that won't work, such as the serial, parallel, Midi, joystick/mouse and ACSI port that don't work.

The reason for this is because they require loopback cables in order to properly test these functions, and without, there is simply the report of a failure.

The good new is, that such a solution is still available from Olivier at his web site,

This is what you get:

Loopback_Cables.jpg (195.07 KiB) Viewed 4182 times

So what you see is:

A central loopback testing hub.
A 25 pin serial port test dongle.
A 9 pin serial port test dongle.
2x 9 pin joystick/mouse port testing cables.
An ACSI test cable.
A Centronics/printer test cable.
A Midi test cable.

I also opted to buy a 2nd diagnostic cartridge to make a little kit up, which can be seen on the right.

To follow will be examples of testing using this kit, and showing the results for the standard ST range of machines.

I hope you'll find it useful.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...