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Steve Guidi

NTSC/PAL Color and Clock Switcher Project?

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Hello!  I'm wondering of anyone has investigated the feasibility of modding a 2600 so that you can switch between clock frequencies and/or color palettes.  The goal of such a project would be to play cartridges of differing regions on the same machine.

 

I've seen a similar project on a Commodore 16 where the clock crystal was replaced with an Arduino, the latter programmed to output different selectable frequencies to produce a signal for PAL and NTSC video.

 

As for the color palette, I believe that would require a swap of the TIA chip, which could be done manually if the board is socketed.

 

I haven't studied the schematic, and a cursory search doesn't show anything useful.  To anyone with the hardware experience, do these ideas seem sound?

 

My assumption is that the only difference between a PAL, NTSC, and SECAM 2600 are the clock crystal and TIA since the game cartridge does all the video synch.

 

Steve Guidi

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2 hours ago, Steve Guidi said:

As for the color palette, I believe that would require a swap of the TIA chip, which could be done manually if the board is socketed.

Unfortunately, this is not as simple as I had hoped.  The TIA from NTSC and PAL systems are not pin-compatible.

 

atari2600_tias.jpg

(from https://amazingdiy.wordpress.com/2011/07/21/atari-2600-video-mod/)

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