The fact that modern televisions cannot hack it is not as surprising as it might seem. A line update with the traditional hardware is 40 character writes to a dual-port VRAM. Hardware does the character generation and graphics conversions.
But modern televisions do all of the rendering to a graphics mode display buffer, and probably aren't engineered with the idea that the teletext data may be arriving so fast (as it would usually only be a few lines changing per frame in interleaved magazine mode) as to compete with other demands upon video RAM. It's probably implemented in a very basic way, because it was good enough.
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The fact that modern televisions cannot hack it is not as surprising as it might seem. A line update with the traditional hardware is 40 character writes to a dual-port VRAM. Hardware does the character generation and graphics conversions.
But modern televisions do all of the rendering to a graphics mode display buffer, and probably aren't engineered with the idea that the teletext data may be arriving so fast (as it would usually only be a few lines changing per frame in interleaved magazine mode) as to compete with other demands upon video RAM. It's probably implemented in a very basic way, because it was good enough.