Hi guys, a bit more info on Nintendo 64 PAL-M vs NTSC
Gradiente (the company) received the american NTSC N64 , opened and used a technique called "Transcoding" to make it PAL-M compatible. They changed the u color subcarrier frequency.. then shipped to costumers. Bear in mind most TVs at that time could not handle NTSC signals. NTSC/PAL/PAL-M combo sets became standard in late 90's in Brazil.
color subcarrier standard:
- NTSC: 3.579545 MHz
- PAL: 4.43361875 MHz
- PAL-M: 3.575611 MHz
Some people say PAL-M N64 are somehow superior because of 60hz and better color "frequency" but I don't think that is true. In fact the main company responsible for making NTSC -> PAL-M had large demand so I don't think they used the best components.
Many USA consoles existed and were sold in Brazil but most of them were transcoded to PAL-M unofficially . TV sets have to decode PAL-M signals as well and this can cause issues.
Bottom line: I don't like PAL-M Nintendo 64 picture. The good news is that you can switch back to NTSC if you have some skills.