this post was submitted on 11 Oct 2023
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the adc connector was mostly proprietary in the sense that nobody else used it. third party manufacturers had no problem making adapters and cables without apple's permission, as evidenced by the the belkin dongle this article is talking about.
what you're really asking for is an industry standard, which is different from an open standard. however, an industry standard requires the industry as a whole to buy in to it. if they say no, but you still want to solve a problem that their existing standards do not, what do you do?
industry standards also do not typically appear overnight. usually, companies put out multiple solutions trying to solve new problems, and eventually the industry coalesces around a preferred solution. USB was introduced in 1996 with full support for mice and keyboards, but it took nearly a decade to become the de facto connector for mice and keyboards.
I am asking for specifications to be released without patents or have patents signed over to an organization like VESA. Whether it becomes popular or not is another story.
i don't think adc was encumbered by patents, at least not in any way that prevented other manufacturers from making use of it. it wasn't locked down behind special handshakes and a certification program like lightning is. it used the same signaling protocol that dvi ended up using, which is why passive adapters like the belkin one above were possible. the additional pins on the connector were used for power and usb. the specifications were freely available, and monitors, gpus, and kvms were released that used the connector in the late '90s and early '00s.
the problem people are haivng is that this connector did not see wide use, so cables and adapters are hard to come by 25 years after the fact.
putting vesa in charge wouldn't change anything here unless vesa decided to ditch dvi and push this connector instead. however, that probably wouldn't have happened, because their constituents (most wintel pc makers) would have preferred the cheaper solution of not bundling video, power, and usb in a single cable.
If it were, they'd likely be expired by now.
I wonder if an adapter could be made some "DIY" way, if it needs to be active, it could be a fun project for someone into FPGAs.
It's incredibly easy to make an adapter. You really only need the female DVI and ADC ports (you could probably sacrifice a few cables if you can't get the connectors, too), a breadboard and some wire. https://lookanotherblog.com/diy-adc-adapter/
the adapter is passive since both connectors use the same signaling protocol
the problem is that designing tooling to manufacture a custom connector at scale is expensive, so nobody is going to do that until they know there is enough demand to at least cover the upfront cost of designing that tooling and manufacturing a bunch of these.
I didn't notice at first, the article itself links to a seemingly easy way of making a DIY adapter:
http://damntechnology.blogspot.com/2009/02/hacking-dvi-cable-to-build-adc-to-dvi.html
If the demand is low enough to not even bother stocking them anymore, it would seem like someone could offer to sell them on Etsy or something, doesn't seem to require much much tooling.
You’re missing the point that if Apple had just given it to VESA, it would have become the de-facto standard instead of DVI because other companies would rather reuse ADC than design DVI from scratch.
i think i laid out exactly why that most likely wouldn’t have happened
i don’t think there is any reason vesa couldn’t have adopted it if they wanted, the connectors are already extremely similar. the problem is they didn’t want a connector that also handles power and usb, because that would have raised costs for pc manufacturers
As a consumer, would have been pretty cool if DVI carried USB too.
Instead, almost every monitor bundles a USB hub that needs an extra cable. Not sure how that saved manufacturers money.
you have to remember this was 1998, and apple was the first company going all-in on usb for peripherals, using it to replace the aging apple desktop bus.
the cost concern also has more to do with low end machines in that time frame. if the connector included it, then any devices that used it would need usb support. at a time when usb was still brand new, and most pcs that had it shipped with controllers that only supported one or two ports.
ADC is incredibly inconvientient, because it doesn't support hotplugging. It also requires the computer to contain a power supply for the screen.