Amiga.org
Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: motorollin on December 04, 2005, 05:25:08 PM
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For the benefit of prismra, who asked about this, and also anyone else who is interested, here is a schematic of the cable I built to use an ATX power supply with my A1200.
(http://i298.photobucket.com/albums/mm244/motorollin/aorg/ATX-Amiga.gif)
Please check the pinout of your ATX and Amiga power supplies before connecting this. You should also check the output from the Amiga's power connector after connecting and powering on the ATX power supply, to make sure it is outputting the correct voltage for the Amiga. Pins 14 and 15 are connected to each other to make the PSU power up.
Usual disclaimer applies - this worked for me but may or may not blow your Amiga up :roll:
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moto
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Ehh, shouldn't the red and the yellow wire go to two different pins on the A1200 connector?
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pins 19 and 20 are both +5v (its ok due the thin ATX wires)
http://pinouts.ru/data/atxpower_pinout.shtml
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@motorollin
You should perhaps mark from which side the connectors are seen (or else someone might mirror the connections, though that should be caught when testing the voltages).
Also, this configuration doesn't work (or rather always works;) for PSUs that don't have the power switch on the back, this config is always powered. I'd suggest attaching the powerswitch between pins 14 and 15 instead of just short circuiting the pins.
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Will this work on an Amiga 4000?
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doctorq wrote:
Ehh, shouldn't the red and the yellow wire go to two different pins on the A1200 connector?
No they're connected to the same pin on mine.
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moto
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Piru wrote:
@motorollin
You should perhaps mark from which side the connectors are seen (or else someone might mirror the connections, though that should be caught when testing the voltages).
You can tell by the location of the square holes.
Piru wrote:
Also, this configuration doesn't work (or rather always works;) for PSUs that don't have the power switch on the back, this config is always powered. I'd suggest attaching the powerswitch between pins 14 and 15 instead of just short circuiting the pins.
Quite correct. My ATX PSU had a power switch on the back so I didn't need to do this. But as you say a switch between the two pins would add a power switch to the configuration.
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moto
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@motorollin
You can tell by the location of the square holes.
I don't see any square hole on the amiga side connector.
It might be obvious to you (you did draw it after all), but it might not be to everyone else.
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Piru wrote:
@motorollin
You can tell by the location of the square holes.
I don't see any square hole on the amiga side connector.
It might be obvious to you (you did draw it after all), but it might not be to everyone else.
Ahhhh yes of course. You can tell by the colours of the wires. When I drew the schematic, I did it as if you were looking at the connector.
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moto
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Soo... has the picture at the top been corrected / confirmed?
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The picture is correct. I have the cable sitting next to me :-)
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moto
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Where do I get a connector that fits the A1200 power plug?
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From an A1200 PSU? :-) I just cut mine off.
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moto
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What's to stop me from just buying a UK 220v PSU for it and using a step-down (?) converter from Radio Shack or something?
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Can you elaborate, I'm not sure I understand what you mean :-)
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moto
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Well aren't there converter that allow you to use UK powered devices on a US wall plug?
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Yes you could use an inverter which would take a 110v suppply from a US outlet and supply 220v. Then you could connect a UK Amiga PSU to the 220v supply.
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moto
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Will I have any issues with a PAL motherboard. I'm never going to connect it to a TV (I don't think). Probably going to track down a 1084 Commodore monitor so...
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iv added a rocker switch to my a1200 desktop.
one wire goes to earth ( inside the a1200 ) & a single wire comes out & goes to the power on ( green wire )..
this is great as i can reset/turn on my a1200 without breaking my back..
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prismra wrote:
Will I have any issues with a PAL motherboard. I'm never going to connect it to a TV (I don't think). Probably going to track down a 1084 Commodore monitor so...
Hmmm I'm not sure to be honest. I don't know anything about the 1084. A google search may reveal whether it can display pal screenmodes. Is there a reason you're using a PAL Amiga? Why not NTSC?
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moto
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I may be able to get one on the cheap. So that may be how I'm going to do it.
The two problems I have are:
What monitor to get (no 'new' VGA monitor supports 15khz.)
Where to get a god damn 110v power supply.
Grrrr.
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I've had a look on eBay and can't find any 110v PSUs. Your best bet would probably be to get an inverter from RS or a local hardware store, and then you can use any 220v PSU.
Also, I've discovered that 1084s come in PAL and NTSC flavours, so you would need to get the correct one for your Amiga. The cheaper alternative would be to use a TV. The best, but probably most expensive option is to get a scandoubler and use a VGA monitor.
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moto