Amiga 1200s are ancient now... if you're having phantom issues with hardware or software then a crappy power supply may be to blame! Adding extra hardware, overclocking and otherwise modding these old machines also puts undue strain on their ageing power supplies.
Due to this, it's best to prevent problems and provide a fresh and powerful source from which the A1200 can drain as many electrons as it wants.
Wiring up an ATX Power Supply
This is very straight-forward. All ATX supplies provide the required wires for the Amiga motherboards. Unfortunately, they also provide 100 other cables of which we don't need.
Ian Stedman's site has all the information you need to get the power supply hooked up. I followed the instructions and had no issues at all.
If you're installing this in a tower case, then you can easily hide the extra wiring. If you're still using the 'keyboard' case, then you may want to find a way to discard all the extra cables. One method might be to de-solder or cut them right back at the power supply main board. Just be careful if you're opening it.
The wiring for the cable goes as follows.
|ATX Power Supply||Red||Yellow||Blue||Black||not connected|
Note: Don't forget to connect green from the ATX supply to ground! This is the soft-power latch that needs to be grounded for the supply to turn on.
I entirely recommend you confirm the wiring from your Amiga power cable is wired as above! Also make sure that you test the cable prior to plugging it in to your Amiga!
After a quick test, I plugged it in and the A1200 purred away. Unfortunately my PCMCIA Ethernet issues still continued!