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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: blakespot on July 04, 2013, 01:32:11 PM

Title: NTSC A1000 to PAL?
Post by: blakespot on July 04, 2013, 01:32:11 PM

I have an NTSC Amiga 1000. It has an 8361 Agnus, presumably.

I am pretty certain there is no way to soft-push this machine to PAL mode. If I were to replace the 8361 with an 8367 (PAL version of Agnus), would the system be a PAL system, or are things more complicated than that?

It would be nice to be able to watch demos on this Amiga but, of course, basically all demos are semi-broken on an NTSC machine in NTSC mode.

Thanks.




bp

Title: Re: NTSC A1000 to PAL?
Post by: desantii on July 04, 2013, 02:51:15 PM

You probably need to change the oscillator as well

Title: Re: NTSC A1000 to PAL?
Post by: amiman99 on July 04, 2013, 07:25:26 PM

I think it's harder then you think. I was looking into it some time ago and made a screenshot comparison of the video circuit from PAL and NTSC motherboards. There are few differences , see attached picture.

The easiest way to play PAL games/demos is to use A500.

Title: Re: NTSC A1000 to PAL?
Post by: mrknight on July 05, 2013, 12:03:51 AM

I bought an A1000 earlier this year and it was a US model. I need to use a 240/120VAC transformer (why can't everyone use 240VAC?). Once when I run Sysinfo it reported it as a PAL machine with a 68010CPU (IIRC). I was confused! I opened it up and it was a big expansion board in there that gave me a total of 1.5MB RAM.

I can check again if you are interested and maybe open it up and have a look. If my A1000 is a pal machine then it is proven they can be modified.

Edit: I think this is the board that is inside
http://www.bigbookofamigahardware.com/bboah/product.aspx?id=990

Title: Re: NTSC A1000 to PAL?
Post by: amiman99 on July 05, 2013, 01:23:38 AM

I think most PAL A1000 don't have the daughterboard installed.
http://www.bboah-works.de/download_photos/a1000mbreva.jpg

Title: Re: NTSC A1000 to PAL?
Post by: psxphill on July 05, 2013, 01:56:31 AM

Quote from: blakespot;739815

I am pretty certain there is no way to soft-push this machine to PAL mode. If I were to replace the 8361 with an 8367 (PAL version of Agnus), would the system be a PAL system, or are things more complicated than that?

 I'm not sure I'd use an A1000 for that, an ECS A500 would be better.
 
 However I don't think it is supposed to be that much more complicated than switching the Agnus. The oscillator appears to be optional.
 
 http://www.amiga.org/forums/showthread.php?t=60206

 You might have an early Denise that doesn't support Extra Half Bright &  wouldn't count on the composite video outputting colour (either NTSC or PAL standard).