PAL TO NSTC MODIFICATION! HOW TO DO IT?

[famifan]

well, as you might noticed modding to PAL-60 instead of NTSC doesn't seem to require a use of different crystal.

sounds that it only works on specific PPUs.
Post Merge: January 28, 2016, 06:43:38 am
let me explain.

color subcarrier remains the same. The amount of scanlines per second is near the same.

525*30=15750
625*25=15625

IMHO, it seems like that pin triggers internal divider/counter to shift vertical blanking signal to a different value.

[SquallDark]

Hi. I tried some days ago the 16p-bridge on my Spanish Nasa NS-81 with PAL CPU UA6527P and NTSC PPU UA6538 and didn't work, changed the Crystal for one 21.47 but the console just don't bring any image (tested in CRT too), I read a Spanish guy say he was able to change her clone to 60Hz modifying the multiplier with a resistor (I don't know what that means), but he didn't mention what chipset was, if that console was an Spanish version like mine for sure he got a UA6527P/TA-03XXX or equivalent.

I contacted with that guy but no answer, I wish there's a possible way to change to 60Hz in 6527P without replace the CPU, if someone here have more information I will appreciate he can share with us.

Edit: Some images from my NS-81 PCB.



Thanks. See ya.

[chowder]

Does anyone know how to tell the difference between PAL-60 and NTSC?  My TV doesn't say what the input is, would the music sound different between the two or something?

[P]

The only difference would be the colour encoding. PAL-60 simply means PAL encoding but with 60 Hz framerate (PAL means PAL encoding and 50 Hz framerate). Sound isn't carried in the NTSC/PAL signal, only video.

I have no idea how to tell the difference between PAL and NTSC colour encoding though.

[chowder]

Thanks P