> we can use the TV output too.

You still need jumpers, to select NTSC, PAL, SECAM.

> Everybody have a TV.

You'd be surprised.  I once heard someone brag that they had 7 CRTs
and none of them would display a TV picture.  An o'scope or 2,
a curve tracer, some computer monitors (fixed freq of course),
I'm not sure what else he had.

Someone suggested a bootable file that would set the mode.
Which sounded promising at first, until I thought about each type
of media needing a different format, and different CPU arches
needed different files, and even different platforms using the same
CPU arch need different boot files.  The number of combinations
quickly becomes unworkable.  And where do you get access to all
these platforms for testing?

The more I think about this, the more I like the rs-232 solution.
It doesn't provide the no-extra-hardware-required solution that
jumpers do, but the types of people who have fixed freq monitors
are likely to have a way to talk to rs-232.  Unless we can get a
complete list of modes, we would need a lot of jumpers if we want
to cover all the possible cases.  And while a few jumpers seem
reasonable, several dozen of them start to take a toll.  And
jumpers don't help with debugging or allow remote system consoles,
etc.
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