29 replies to this topic

[Rybags]

Would have been nice if Antic just had a bitsetting... there's probably no internal difference between Pal/NSTC Antic other than a few constants relating to vertical timing.

And with a good modern TV, it should easily tolerate the resultant timing difference thanks to the slightly slower Pal system clock.

[snicklin]

potatohead, on Sat Mar 20, 2010 8:08 PM, said:

It is possible to convince a NTSC 8 bit Atari to output 50Hz frames?

My CoCo 3 does this with a simple switch, and it works great!

Not that I know of, I wish it was that easy!

[potatohead]

I've read that Amigas do that too. I do know that an awful lot of TVs will display it.

[Lazarus]

potatohead, on Sun Mar 28, 2010 9:51 AM, said:

I've read that Amigas do that too. I do know that an awful lot of TVs will display it.

Amigas with ECS/AGA Agnus can switch between 50 and 60 Hz. But that has nothing to do with PAL or NTSC since PAL/NTSC are color encoding schemes which (most) Amigas do not output. Amigas video is analog RGB and not PAL or NTSC. Older Amigas with OCS Agnus (8371) cannot switch between 50/60 Hz.

Edited by Lazarus, Mon Mar 29, 2010 6:29 AM.

[Rybags]

ST can also do 50/60 switch, C= Plus/4 the same. Although I believe the Amiga and Plus/4 retain the same cycles per scanline and the system clocks are slightly different between systems, like the A8.

I would guess that any TV that happily displays 50/60 refresh rates would probably be fine with the slightly off-spec horizontal frequency. And, all systems mentioned still use the native encoding... not sure about inside the US, but the rest of us tend to call NTSC by NTSC 3.59 or NTSC 4.3 depending on whether it uses it's native, or PAL type encoding.