Back in 2015 @ZackAttack suggested using a timer in the ARM to detect if a 2600 was NTSC or PAL. Basically the ARM is fast enough to detect the difference in clock speeds between the NTSC and PAL consoles. While working on Draconian I decided to try this out and it was successful.   While I was adding ARM timer support to Stella @alex_79 pointed out that the clock for SECAM was different from both NTSC and PAL. Knowing that, I was able to update the routine detect between all 3.