[Arm-netbook] Question about resolution on the micro-desktop

Luke Kenneth Casson Leighton lkcl at lkcl.net
Fri Jan 13 15:42:30 GMT 2017


---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Fri, Jan 13, 2017 at 2:52 PM, Julie Marchant <onpon4 at riseup.net> wrote:
> Hey, I'm wondering something.
>
> So, one of the features of the micro-desktop is a VGA port.

 correct.

> I assume that it's probably connected to the RGB/TTL, right?

 correct.  the PDFs of the schematics are available for anyone to confirm that.

> And the page on the
> EOMA68 standard states:
>
>> The maximum RGB/TTL resolution permitted is 1366 x 768.

 correct.

> So then, does that mean that the VGA port on the micro-desktop is
> limited to resolutions no larger than this?

 that's incorrect.  you're perfectly entitled to try resolutions
beyond that which are required by the EOMA68 specification (however do
not be surprised if it doesn't actually work).

 in the case of the A20 Card, the RGB/TTL output *happens* to be
capable of driving up to 1920x1080 @ 60fps, which happens to be well
beyond what i would expect the PCMCIA interface to cope with without
creating EMF interference (which will be your problem to deal with if
you go beyond the specification).

 but all of this doesn't make sense - these "arbitrary-seeming"
restrictions - make absolutely no sense until one SoC *happens* to be
encountered that is *NOT* capable of greater than 1366x768.  which is
not *right now* but will occur in the future.

 bottom line: if you develop an app that violates the EOMA68
specification, then your clients all upgrade (without telling you) to
a future card and they *ALL* complain "your app dun't wurk no more",
don't come crying to me :)

l.



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