Amiga 3000 - does its psu definitely need -5v

trixster · 31 October 2019, 16:03

Hi,

I understand that the 3000D power supply provides -5v. What does the machine use this for?

Can a 3000 operate from a power supply that does not supply -5v? Or will it not even turn on if -5v is not present? If it does work, what functionality is lost by the lack of -5v?

Hedeon · 31 October 2019, 16:59

Too many questions. Just sell that AA3000+ board (populated) to me and be done with it.

trixster · 31 October 2019, 17:05

I’ll think about it!

Daedalus · 31 October 2019, 17:11

It'll run fine without -5V - nothing on the board needs it or checks for it. It's only needed as a requirement for the Zorro and ISA specs.

trixster · 31 October 2019, 17:12

Thanks Rob

Hewitson · 01 November 2019, 11:54

Quote:

Originally Posted by Daedalus

It'll run fine without -5V - nothing on the board needs it or checks for it. It's only needed as a requirement for the Zorro and ISA specs.

Do any cards (either Zorro or ISA) actually require it?

Daedalus · 01 November 2019, 12:46

None that I'm aware of, but of course there are plenty of cards I've never seen, particularly ISA cards. If any cards do, they'll be older cards with analogue functions like soundcards, video capture cards and the like. It's possible the Video toaster does for example, but I can't confirm that.

31 October 2019, 16:03	#1
trixster Guru Meditating Join Date: Jun 2014 Location: England Posts: 2,346	Amiga 3000 - does its psu definitely need -5v Hi, I understand that the 3000D power supply provides -5v. What does the machine use this for? Can a 3000 operate from a power supply that does not supply -5v? Or will it not even turn on if -5v is not present? If it does work, what functionality is lost by the lack of -5v?

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31 October 2019, 16:59	#2
Hedeon Semi-Retired Join Date: Mar 2012 Location: Leiden / The Netherlands Posts: 2,017	Too many questions. Just sell that AA3000+ board (populated) to me and be done with it.

31 October 2019, 17:05	#3
trixster Guru Meditating Join Date: Jun 2014 Location: England Posts: 2,346	I’ll think about it!

31 October 2019, 17:11	#4
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,369	It'll run fine without -5V - nothing on the board needs it or checks for it. It's only needed as a requirement for the Zorro and ISA specs.

31 October 2019, 17:12	#5
trixster Guru Meditating Join Date: Jun 2014 Location: England Posts: 2,346	Thanks Rob

01 November 2019, 12:46	#7
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,369	None that I'm aware of, but of course there are plenty of cards I've never seen, particularly ISA cards. If any cards do, they'll be older cards with analogue functions like soundcards, video capture cards and the like. It's possible the Video toaster does for example, but I can't confirm that.

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