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Kind of excessive for something that can be done with some passives if you don’t need to also scan-convert…

It's the opposite of excessive. If you need scan conversion, which you almost certainly do, this is far cheaper than just about anything else you can use to get a usable video signal out of a compact Macintosh.

Indeed, I believe 512x342@60.15 is almost certainly within the range of what every LCD these days can sync to.

Compact Macs have a horizontal scanning frequency of 22.2kHz. Good luck finding an LCD that will sync to that.

Fun bit of trivia: Compact Macs also used the video scanning sync timing to feed the audio DAC, producing 8-bit audio at 22.2kHz. Pretty good for 1984!

Compact Macs have a horizontal scanning frequency of 22.2kHz. Good luck finding an LCD that will sync to that

Many will go down to 15kHz (CGA), and some EGA modes also use 22kHz:

http://15khz.wikidot.com/

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