Need a PSU for my towered A1200

[blakespot]

So, I have a towered Amiga 1200 '060 in a 'Noblesse' case that I got from Revanche, LLC.

http://www.flickr.com/photos/blakespot/sets/72157604300573758/

I've had it for 8 years or so, now. A few years back it started going wonky, and I decided that the PSU was failing, so I went and bought another PSU from the local store -- standard PC tower PSU. Well, it lacked this middle-sized power lead that was present on the original tower's power supply, and so I was not able to plug the A1200-to-PC-PSU cable that Revanche threw in into the new power supply. To remedy this, I set out finding the pinout of that missing lead and wiring the Amiga adapter cable into other parts of the new PSU power leads. And it worked...sort of. The machine has been quite touchy ever since, and growing more so.

So. I would like to get a new PC PSU (as I hacked this current one up) and some method of getting that PSU tied into the Amiga 1200. This would, presumably, be an adapter cable that ties to one of the more standard leads coming out of a modern PSU.

Can anyone point me to such an adapter cable for use with a standard ATX power supply or a PSU / adapter combo that will work in my case?

Thanks much.




bp

[blakespot]

I ordered this. Will salvage the cable segment I have with A1200 PSU adapter on end and wire in.

http://www.ianstedman.co.uk/Amiga/designs/Amiga_ATX_Adaptor/amiga_atx_adaptor.html



bp

[blakespot]

Ok, I have a new PSU and received the A1200 power adapter board to use in wiring the power into the Amiga 1200. Details of the adapter here: http://www.ianstedman.co.uk/downloads/AmigaATXpoweradaptorinstall.pdf

So...I pulled out my digital multimeter to verify the wire colors with the leads on the A1200 plug end, and discovered something odd. There are 5 pins on the Amiga 1200 adapter plug. The plug that came with this A1200 tower has 4 wires coming off of it.

Only two wires are showing continuity from the freshly stripped end to the pin on the A1200 power plug. Just +12v and -12v. No ground, no +5v. Could this be the intended config, or should I conclude that the two other wires coming off the plug have recently become disconnected from the pins inside the rubber housing?

I had been using the Amiga 1200 with that config, plugged into my old ATX PSU with floppy power going into the Amiga 1200 floppy power jack for quite a while, before that PSU died. I am now trying to get running with a new PSU.

Surely a ground should be wired, yes? Is it dangerous to proceed with just +12v and -12v going into the main power connector?





bp