PAL Mod on Rev 1 NTSC VIC 20?

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gordonf
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PAL Mod on Rev 1 NTSC VIC 20?

Post by gordonf »

I read that the Revision 1 VIC 20s have separate NTSC and PAL versions, with the PAL ones sporting extra traces on the board. The Revision 2 boards were more harmonized so it was possible to have either video standard on them depending on the crystal and 6560 / 6561 IC used.

I only have spare Rev 1 boards and I want to convert one of them to PAL and S-Video. I found this on Zimmers:

https://www.zimmers.net/anonftp/pub/cbm ... -NTSC.html

So I can see the Rev 1 conversion from PAL to NTSC. Do I just perform the reverse of this to go from NTSC to PAL?
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Orangeman96
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Re: PAL Mod on Rev 1 NTSC VIC 20?

Post by Orangeman96 »

I reckon there is a large body of knowledge already accessible here available via the [Search... ] box with the magnifying glass to the right of it above. GOOD LUCK! -OGM
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TheVic20User
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Re: PAL Mod on Rev 1 NTSC VIC 20?

Post by TheVic20User »

gordonf wrote: Mon Mar 10, 2025 6:58 am I read that the Revision 1 VIC 20s have separate NTSC and PAL versions, with the PAL ones sporting extra traces on the board. The Revision 2 boards were more harmonized so it was possible to have either video standard on them depending on the crystal and 6560 / 6561 IC used.

I only have spare Rev 1 boards and I want to convert one of them to PAL and S-Video. I found this on Zimmers:

https://www.zimmers.net/anonftp/pub/cbm ... -NTSC.html

So I can see the Rev 1 conversion from PAL to NTSC. Do I just perform the reverse of this to go from NTSC to PAL?
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Personally, I think such conversions are just too bad. I would also like to get hold of an NTSC device, but you don't really get it in this country. I would like to exchange my working fully equipped PAL board for NTSC board.
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gordonf
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Re: PAL Mod on Rev 1 NTSC VIC 20?

Post by gordonf »

TheVic20User wrote: Wed Mar 19, 2025 12:52 pm I would like to exchange my working fully equipped PAL board for NTSC board.
If you're serious about this I'll consider it. I have to get my NTSC board working first - the VIC 20 was recovered from a cat-infested location.

What revision of PAL board are you considering swapping? If it's a Rev 2 board I'll need the RF shield underside as well so it will mount in a case.
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TheVic20User
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Re: PAL Mod on Rev 1 NTSC VIC 20?

Post by TheVic20User »

If the board works, I would do it. I have the original first PAL board with 2pin plug. However, I come from Germany. Unfortunately, I don't know what the shipping costs would be. And if it would be worth it for us.
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