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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: redrumloa on September 09, 2003, 07:19:38 PM

Title: Amiga 4000 power supply question
Post by: redrumloa on September 09, 2003, 07:19:38 PM

Referencing THIS (http://www.ntrautanen.fi/computers/hardware/misc/a4000_power.htm) pinout, I have the following question.

Quote

Power Good is a TTL output from the power supply, a logical high indicating a stable power supply.

So basically I am guessing there needs to be +5V (??)present on this pin for the motherboard to determine there is a good power supply?

Title: Re: Amiga 4000 power supply question
Post by: redrumloa on September 09, 2003, 08:43:09 PM

Aw come on, simple question! The answer I'm pretty sure i know I just want to confirm!

Also the A4000 doesn't have a tick signal pin like the A3000 correct? What I see is what I get?

Title: Re: Amiga 4000 power supply question
Post by: Karlos on September 09, 2003, 09:03:40 PM

Regarding the PwrGd pin, it looks that way to me. It doesn't say its active low so I'd assume it's +5v normally.

As for the tick signal, no idea...

Title: Re: Amiga 4000 power supply question
Post by: JimS on September 10, 2003, 04:12:19 AM

I think you're right on the "power good" in the 4000 that goes to a signal called _FAIL  which is pulled up to 5v.  So if it is held low, that means the power is bad.

From the schematics, it looks like the 4000 does have a 'tick' signal, but it's generated internally from VSYNC.

Title: Re: Amiga 4000 power supply question
Post by: redrumloa on September 10, 2003, 02:38:21 PM

@JimS and Karlos

Fantastic!! This is the info i was looking for! In my wheeling and dealing I have gotten an A4000.

Now the hard decision if to keep it or resell it. :-x I have never owned an A4000, but would i really use it? I mean I have a peggy...

Title: Re: Amiga 4000 power supply question
Post by: Karlos on September 10, 2003, 02:42:16 PM

"You must send it to me"
"You must send it to me"
"You must send it to me"
"You must send it to me"
"You must send it to me"
"You must send it to me"
"You must send it to me"

When I close this tag, you will package said A4K and ship it to my home address that I just dropped into your private messages ;-)

Title: Re: Amiga 4000 power supply question
Post by: Skyraker on September 10, 2003, 02:48:44 PM

@Red

Quote

Now the hard decision if to keep it or resell it.  I have never owned an A4000, but would i really use it? I mean I have a peggy...

Sure , the A4000 would make an excellent upgrade from a Peg. ;)

Title: Re: Amiga 4000 power supply question
Post by: Dr_Righteous on September 10, 2003, 03:19:46 PM

KEEP IT!

There's just no substitute for the real deal. C'mon, with all the other machines you have, you might as well have one of each!  :-D