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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: blakespot on November 04, 2020, 10:32:12 PM

Title: NTSC A2000 w/ rev 6.3 mobo and 8375 Agnus - can I hardwire to PAL?
Post by: blakespot on November 04, 2020, 10:32:12 PM

I have an NTSC A2000 w/ rev 6.3 motherboard and the ECS chipset w/ 8375 (can support 2MB) Agnus. Here is a photo of Agnus and jumper J102:

https://www.flickr.com/photos/blakespot/5586840948/in/album-72157604299491786/

I looked into this some years ago and determined I could not hard-jump this to PAL, is that correct? Thanks.



bp

Title: Re: NTSC A2000 w/ rev 6.3 mobo and 8375 Agnus - can I hardwire to PAL?
Post by: Jope on November 05, 2020, 11:31:31 AM

The 8375 comes in lots of different flavours.

Yours is a 318069-17 which is a 1MB part, NTSC only. The PAL/NTSC pin has been repurposed to Vbb.

Your board appears to be correctly configured for this revision of the Agnus.

http://www.amigawiki.org/lib/exe/fetch.php?media=de:parts:agnus_reworks.pdf

And as you suspected, it is not possible to force to PAL in hardware, you must do it in software. If you wish to convert this machine, you should find a 318069-16 chip, which will be directly compatible with your motherboard configuration. I also recommend swapping the 28MHz oscillator to the PAL variant for full timing compatibility.

Title: Re: NTSC A2000 w/ rev 6.3 mobo and 8375 Agnus - can I hardwire to PAL?
Post by: TjLaZer on February 19, 2021, 07:24:37 PM

BootPAL is a great little tool.  You run it and it forces machine to PAL on reboot.  So it works with ALL games and demos.  (some NDOS cannot be forced to PAL with the Early Startup menu)