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Old 22 January 2012, 14:09   #1
paulo_becas
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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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Old 22 January 2012, 15:23   #2
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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.
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Old 22 January 2012, 17:21   #3
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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.
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Old 22 January 2012, 18:04   #4
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Quote:
Originally Posted by mfilos View Post
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.
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Old 23 January 2012, 15:12   #5
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Quote:
Originally Posted by paulo_becas View Post
what pin should i isolate?
Pin 41...but not sure if this will work with the Minimegi...although it might...

PZ.
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Old 23 January 2012, 16:44   #6
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Quote:
Originally Posted by mfilos View Post
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.

Last edited by alexh; 23 January 2012 at 17:57.
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Old 23 January 2012, 16:51   #7
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i can change if you want
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Old 23 January 2012, 17:39   #8
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Correct. If you have an 8375 318069-11 then you need an 8375 318069-11
?
Did you mean 318069-12 ?
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Old 23 January 2012, 17:57   #9
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?
Did you mean 318069-12 ?
If you have an 8375 318069-11 then you need an 8375 318069-10 (SAVED)
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Old 23 January 2012, 18:18   #10
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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
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Old 23 January 2012, 23:30   #11
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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
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Old 24 January 2012, 10:35   #12
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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.
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Old 24 January 2012, 13:17   #13
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There's an article about this mod on the 'COSMOS' blog.
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Old 24 January 2012, 14:07   #14
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http://leblogdecosmos.blogspot.com/2...-ntsc-pal.html
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Old 24 January 2012, 15:45   #15
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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
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Old 24 January 2012, 16:03   #16
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Aye AFAIK you need the same series to be able to make the transition correctly.
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Old 24 January 2012, 16:18   #17
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Here's a picture of mine
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Old 24 January 2012, 18:17   #18
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I recommend replacing it with a 8375 318069-10 part to ensure it will work.
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Old 25 January 2012, 00:34   #19
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Quote:
Originally Posted by alexh View Post
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.
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Old 25 January 2012, 10:27   #20
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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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