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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: bloodline on December 05, 2003, 08:30:02 PM

Title: Agnus... and her interchangability
Post by: bloodline on December 05, 2003, 08:30:02 PM

If I swap out an NTSC Agnus from an A1000 Mobo, and pop in a PAL Agnus from an A500... will the A1000 output PAL video signal?


-Edit- Ok, I've just noticed that the A500 has square Agnus... ignore me :-(

Title: Re: Agnus... and her interchangability
Post by: mikeymike on December 05, 2003, 08:50:12 PM

Get the soldering iron out! :-)

Title: Re: Agnus... and her interchangability
Post by: bloodline on December 05, 2003, 09:58:51 PM

Quote

mikeymike wrote:
Get the soldering iron out! :-)

Hahaha, yup, and a hack saw and a hammer... that'll do it :-D

Title: Re: Agnus... and her interchangability
Post by: voytech on December 05, 2003, 10:56:58 PM

Agnus... and her interchangability

Dunno, but shouldn't it be: Agnus... and it's interchangability??

Echh.. Just ignore me...

Title: Re: Agnus... and her interchangability
Post by: tonyw on December 05, 2003, 11:35:43 PM

What do you mean by PAL/NTSC? Do you mean also the colour encoding of the composite video output? If so, you have to change a lot more hardware than just Agnus.

The early A1000s that were sold here in Oz had PAL Agnus (so they generated PAL scan rates), but NTSC colour subcarrier oscillators and encoders, so they generated NTSC-like colour output.

I had to change the video clock crystal and then rebuild the chroma encoder. I did it some years ago on my A1000 and the results were not "broadcast quality", to say the least. It was watchable on a TV and for VCR use it was almost OK, but you'd use an RGB feed if you could.

I think you'll find that most TVs these days are "downwards-compatible" to accept the old-fashioned NTSC signal, anyway.

tony