Converting Minimegi NTSC chip to PAL

paulo_becas · 22 January 2012, 13:09

Ok, here's the thing, i have a minimegi chip on my PAL 500 rev 6a.
Is there a way to change the agnus chip to boot by default to PAL? Like in the 1200 ntsc board that all it needs is to lift a pin for it to boot to PAL as default.
I'm thinking in isolating the agnus pin that's responsable for the NTSC boot.
If, yes, what pin should i isolate?

mfilos · 22 January 2012, 14:23

AFAIK mate you need the appropriate change of Agnus PAL chip for it work (meaning the same series).
If it's soldered, then you need some hot air station to remove it and solder the PAL on in place.

paulo_becas · 22 January 2012, 16:21

Really?
Well, i have indivision ecs installed but i still get the image to be streched.
I read somewhere that the ntsc problem wouldn't matter with indivision installed but looks like it does.

Matt020 · 22 January 2012, 17:04

Quote:

Originally Posted by mfilos

AFAIK mate you need the appropriate change of Agnus PAL chip for it work (meaning the same series).
If it's soldered, then you need some hot air station to remove it and solder the PAL on in place.

I dont know about that, because with Kickstart 2.0 and above you have the option to toggle between NTSC and PAL by entering the early start up menu (hold down left and right mouse button during reset)

I think there is a hack. Search on Amibay for posts by a user called Nathaniel.

Fingerlickin_B · 23 January 2012, 14:12

Quote:

Originally Posted by paulo_becas

what pin should i isolate?

Pin 41...but not sure if this will work with the Minimegi...although it might...

PZ.

alexh · 23 January 2012, 15:44

Quote:

Originally Posted by mfilos

AFAIK mate you need the appropriate change of Agnus PAL chip for it work (meaning the same series).

Correct. If you have an 8375 318069-11 then you need an 8375 318069-10. If you have an 8375 390544-02 then you need 8375 390544-01 etc.

Quote:

Originally Posted by Fingerlickin_B

Pin 41...

Configurable NTSC/PAL pin doesn't exist on 2Mbyte 8375 Agnii. It was a package bond-out option not a pin.

cpiac64 · 23 January 2012, 15:51

i can change if you want

Supamax · 23 January 2012, 16:39

Quote:

Originally Posted by alexh

Correct. If you have an 8375 318069-11 then you need an 8375 318069-11

?
Did you mean 318069-12 ?

alexh · 23 January 2012, 16:57

Quote:

Originally Posted by Supamax

?
Did you mean 318069-12 ?

If you have an 8375 318069-11 then you need an 8375 318069-10 (SAVED)

paulo_becas · 23 January 2012, 17:18

Quote:

Originally Posted by cpiac64

i can change if you want

Do you have a spare pal one?
If so i'll be more than interested in getting it and hiring your services

cpiac64 · 23 January 2012, 22:30

i can remove from a600 pal, but i remember i have used an a500 with fatagnus ntsc and a indivision without problem, test the a500 with monitor or tv via scart

paulo_becas · 24 January 2012, 09:35

Quote:

Originally Posted by cpiac64

i can remove from a600 pal, but i remember i have used an a500 with fatagnus ntsc and a indivision without problem, test the a500 with monitor or tv via scart

I tested it both ways and get the same result.
I'll try it with a diferent monitor to see the result.

gibs · 24 January 2012, 12:17

There's an article about this mod on the 'COSMOS' blog.

mfilos · 24 January 2012, 13:07

http://leblogdecosmos.blogspot.com/2...-ntsc-pal.html

alexh · 24 January 2012, 14:45

Quote:

Originally Posted by mfilos

http://leblogdecosmos.blogspot.com/2...-ntsc-pal.html

Notice that COSMOS is changing one Agnus chip for the identical numbered Agnus chip only with the different dash part indicating PAL.

I'm not 100% sure you can use an 8375 390544-02 part on a board which had an 8375 318069-11 part and vice versa

mfilos · 24 January 2012, 15:03

Aye AFAIK you need the same series to be able to make the transition correctly.

paulo_becas · 24 January 2012, 15:18

Here's a picture of mine

alexh · 24 January 2012, 17:17

I recommend replacing it with a 8375 318069-10 part to ensure it will work.

stachu100 · 24 January 2012, 23:34

Quote:

Originally Posted by alexh

Notice that COSMOS is changing one Agnus chip for the identical numbered Agnus chip only with the different dash part indicating PAL.

I'm not 100% sure you can use an 8375 390544-02 part on a board which had an 8375 318069-11 part and vice versa

You can't mix them.
Pinout is different on these two revisions.
Part must have the same code.
So 8375 390544 NTSC must be replaced by 8375 390544 PAL.
And 8375 318069 NTSC must be replaced by 8375 318069 PAL.
I did that as well:
http://www.amibay.com/showthread.php?t=24137

In my case I've changed 8375 390544-02 to 8375 390544-01.

paulo_becas · 25 January 2012, 09:27

The million dollar question is, where can i get my hands on a pal super agnus compatible with the one i have?

22 January 2012, 13:09	#1
paulo_becas Registered User Join Date: Feb 2010 Location: Porto, Portugal Posts: 464	Converting Minimegi NTSC chip to PAL Ok, here's the thing, i have a minimegi chip on my PAL 500 rev 6a. Is there a way to change the agnus chip to boot by default to PAL? Like in the 1200 ntsc board that all it needs is to lift a pin for it to boot to PAL as default. I'm thinking in isolating the agnus pin that's responsable for the NTSC boot. If, yes, what pin should i isolate?

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22 January 2012, 14:23	#2
mfilos Paranoid Amigoid Join Date: Mar 2008 Location: Athens/Greece Age: 45 Posts: 1,978	AFAIK mate you need the appropriate change of Agnus PAL chip for it work (meaning the same series). If it's soldered, then you need some hot air station to remove it and solder the PAL on in place.

22 January 2012, 16:21	#3
paulo_becas Registered User Join Date: Feb 2010 Location: Porto, Portugal Posts: 464	Really? Well, i have indivision ecs installed but i still get the image to be streched. I read somewhere that the ntsc problem wouldn't matter with indivision installed but looks like it does.

23 January 2012, 15:51	#7
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	i can change if you want

23 January 2012, 22:30	#11
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	i can remove from a600 pal, but i remember i have used an a500 with fatagnus ntsc and a indivision without problem, test the a500 with monitor or tv via scart

24 January 2012, 12:17	#13
gibs Banned Join Date: Jan 2010 Location: france Posts: 932	There's an article about this mod on the 'COSMOS' blog.

24 January 2012, 13:07	#14
mfilos Paranoid Amigoid Join Date: Mar 2008 Location: Athens/Greece Age: 45 Posts: 1,978	http://leblogdecosmos.blogspot.com/2...-ntsc-pal.html

24 January 2012, 15:03	#16
mfilos Paranoid Amigoid Join Date: Mar 2008 Location: Athens/Greece Age: 45 Posts: 1,978	Aye AFAIK you need the same series to be able to make the transition correctly.

24 January 2012, 15:18	#17
paulo_becas Registered User Join Date: Feb 2010 Location: Porto, Portugal Posts: 464	Here's a picture of mine

24 January 2012, 17:17	#18
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,332	I recommend replacing it with a 8375 318069-10 part to ensure it will work.

25 January 2012, 09:27	#20
paulo_becas Registered User Join Date: Feb 2010 Location: Porto, Portugal Posts: 464	The million dollar question is, where can i get my hands on a pal super agnus compatible with the one i have?

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