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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: reddwarfer on December 28, 2005, 12:50:49 PM

Title: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: reddwarfer on December 28, 2005, 12:50:49 PM

Here's the story.....
I was putting my A1200 into a tower and when i came to test it it would not power up through the usual 5 pin power socket. I tried powering it up through the floppy drive connector and it  powers up fine so i can use this to power it.
The question is that the floppy power connector doesn't have -12v like the 5 pin power socket so what is -12v actually used for?

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: amigaoneproductions on December 28, 2005, 01:10:24 PM

I know of one thing at -12v is used for.

Try playing some music (mod, mp3 or whatever)

The sound will probably sound terrible,  the -12v is needed for the audio system,  I don't know if its used for anything else as an Amiga WILL power up and run stuff without it (Hmm thinking about it,  it MIGHT be used for the comms ports in some way or other,  but not 100% sure on that)

If you dont need sound or comms,  you might get away with it

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: uncharted on December 28, 2005, 01:17:26 PM

Yeah it's required for sound.  On my Eyetech EZ tower You had to have an extra wire going into the normal power socket to enable sound.

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: Lando on December 28, 2005, 01:22:51 PM

As well as sound, the serial port won't work either (but then, does anyone actually use their Amiga's serial port?).

Just splice a wire from the -12v on your PSU (blue wire if it's an ATX PSU) and solder or stick it to the middle pin on the A1200 PSU connector.

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: reddwarfer on December 28, 2005, 01:40:29 PM

While we're on the subject - im using an ATX PSU.
To switch the amiga on, i have shorted out a couple of wires so that when ever it is plugged in it switches on.

Is there any way of using the existing soft switch in the Tower case to switch the amiga on?

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: amigaoneproductions on December 28, 2005, 02:17:53 PM

Quote

Is there any way of using the existing soft switch in the Tower case to switch the amiga on?

No,  an atx soft switch is a momentary push to make,  which means when you let go,  the circuit is broken again and the psu will switch off.

What you need to do is replace that switch with a locking or toggle switch that stays in the same state until you press it  again
 

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: reddwarfer on December 28, 2005, 02:23:16 PM

Thanks

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: Doobrey on December 28, 2005, 04:18:21 PM

Quote

reddwarfer wrote:
Is there any way of using the existing soft switch in the Tower case to switch the amiga on?

If it's a non-latching switch, then there's a simple schematic on Ian Stedman's page about Amiga power supplies (http://ianstedman.co.uk/Amiga/amiga_hacks/Amiga_Power_supplies/amiga_power_supplies.html)
 If it's a latching switch then it's a simple matter of wiring the switch to PS-ON and +5v Permanent.(Edit: just like AmigaOneProductions said :lol: )

Title: Re: POWERING THE AMIGA THRU THE FLOPPY CONNECTOR
Post by: Dr_Righteous on December 30, 2005, 04:04:06 AM

...or use an ATX PSU with a main switch in the back.