A1200 Power Pinouts / ATX PSU / Molex Mod.

[Arptastic]

Hi Guys,

I'm sure this has been done many times before - this is my take.

After sitting in a box for quite a few years got the old machine out but couldn't find a PSU, so had a google round and found this: http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_Power_supplies/body_amiga_power_supplies.html - which is an awesome page with all the detail needed.

I decided to put together a simplified graphic, it's not end-to-end but covers the important points.

Low quality - http://files.dustify.net/amiga/A1200-ATX-PSU-Low.jpg
High quality - http://files.dustify.net/amiga/A1200-ATX-PSU-Full.jpg

The high level process goes something like:

• Take system apart down to motherboard
• Solder molex socket onto motherboard
• Strip wires on ATX PSU, attach to molex plug
• Attach ATX PSU-ON wire (green) to ground
• Try it
• Increase size of 'Power' opening on case
• Put it back together

I realise that this is not most ideal or aesthetically pleasing way of doing this but it's easy to do and hope the information will be useful generally.

[Arptastic]

Thanks for the responses guys.

delshay:

a VERY good point RE: not using an unmodified PSU / molex plug.

Also, nice one on passing straight to the floppy, is it worth doing this on any other parts (HD, PCMCIA, 150-pin etc.) ?

[Arptastic]

Hah, great response - you clearly have a good understanding of this!

Unfortunately my A1200 is totally stock except a 2.5" IDE disk, although I am looking at expanding to an 040/060.

Will the lines still be supplied without an expansion card? - If this is the case I can at least go round with the meter and check the key points.

Slightly off-topic question: Is there a specification for the trapdoor expansion / pin-outs available - I have had a google but can't seem to find anything - I am interested to know how the accelerators / memory expansions operate - would also be able to find those 0v and +5/12 lines