Multi region switch mods question

[RetroBVM]

When did games from different regions stop running at different frequencies (50 Hz/60 Hz region switch mods)?

[Fudoh]

For a wide audience and for a system's whole library only with the introduction of HD (PS3/360).

Prior to that ED (480p) capability always forced 60Hz at the same time (Dreamcast for example). For 15khz some games offered a 60Hz mode, but this wasn't universal by any means.

[RetroBVM]

For a wide audience and for a system's whole library only with the introduction of HD (PS3/360).

Prior to that ED (480p) capability always forced 60Hz at the same time (Dreamcast for example). For 15khz some games offered a 60Hz mode, but this wasn't universal by any means.

I always taught, the introduction of optical drives was the moment the consoles dropped the 50Hz/60Hz mode and only used region lock (US,JAP, EU) from that point on.

[Fudoh]

no. Just think of it: SD consoles still had to follow their countries TV standards. Breaking apart from that only became possible with HD.