Toyota AE86

I don't think the mobo/cpu you selected supports DDR3...

I think the shield does the actual capture and processing (there's a microSD slot on it), and the Arduino is only for control and management. An Arduino isn't powerful enough to do more than very rudimentary image I/O.

I came back to visit this forum and actually made a quick Google Search for DOS media players (I do have a retro DOS gaming computer so I have some interest to use it for media playback for show-off purposes... doesn't make sense otherwise!).
 
I found some interesting pages:
https://www.4dos.info/dhardw.htm
http://dosprograms.info.tt/sound.htm
 
Those pages have other interesting software than media players, too.
 
Bottom line: DVD players seem to exist for DOS. Seems like more modern audio formats (FLAC, OGG Vorbis...) can be played back. Quite possibly because some hackers decided we need to do this "just because we can". Most probably majority, if not all, of the more advanced media players was made indeed after Win9X was already the main OS on home PCs.
 
But I didn't scour those pages thoroughly / actually try any of these (yet). A Media Player (for DVDs / SD Video) / Jukebox running DOS is feasible. Does it make sense? No! Is it cool? H**** YEAH!

AFAIK yes

Way back when DOS was new people used their computers very differently. Don't expect to be able to just install a modern audio player or graphical editor. I'd be surprised if you could even find suitable audio drivers for your system or codecs to play anything other than low bitrate WAV files. When the Pentium III came out DOS was already quite obsolete - yours is a Windows 2000 era machine.

What others said, I agree!
 
The question really here is "why"? If it is just because you want to know what one can and could do in DOS, just because you have too much free time, then go for it. Otherwise, it just doesn't make much sense.
 
There are media players for DOS, but they are audio only. I've used cubic player, and it can play practically any audio file if the computer has enough horsepower to play it. So, it is kind of "VLC for DOS", but for Audio files only. A Pentium III should be able to handle any MP3, Ogg Vorbis or FLAC file, so you can use such an old machine as a DOS Jukebox, if you want to. (EDIT: seems like Cubic player does not support ogg vorbis / FLAC, though, only MP3, tracker file formats, direct CD playback etc.)
 
DemoScene was quite big back in the day, and there were loads of music trackers floating around (Fast Tracker II, Scream Tracker, Impulse Tracker...). There are still modern trackers today and some are in active development (modplug tracker? Milky Tracker?), but most home music making software have evolved into something a bit more advanced. After all, a music tracker is a bit of limited as a concept by todays standards, but many home studio software still can have some elements of their UI and can do everything a tracker could, and a lot more.
 
I recall I used to play with Deluxe Paint and similar drawing applications back then.
 
DOS did have some business applications at the time. I never used them, as I was a gaming teen but something like WordPerfect comes into my mind (seems like it still exists as a trademark, but it's history is indeed very long, seems to even predate DOS). I don't remember other names at the moment, perhaps CorelDraw? There probably were some CAD applications, but they will probably be very, very rudimentary and more complex to use. I would imagine having to parametrize everything by typing, and for any kind of preview of something complex, wait for 5 seconds or more for the render to complete. CAD was a thing, but serious CAD designers and businesses had something more powerful and expensive (PowerPC workstations?) and/or the workflow was much, much more different, probably awkward by todays standards. But I'm a bit guessing here since I'm too young to actually having used any kind of CAD in DOS.
 
I don't ever recall seeing a video player for DOS. Moving digitized video on home computers was a curiosity back then, and the quality was not something you would actually want to look for a prolonged time. I recall seeing Media Players capable playing some kind of video in windows 3.11, but it was not HD, not even SD, but something way, way worse. HD space and optical media could not have been able to hold large enough files anyways, even if some processors could have been fast enough for SD video.
 
After HDDs became large enough and optical media more common - SD video crept also into computer screens. Media space was the last bottle neck, I believe. But that was in Windows 9X era.

specs? 
you'd be better using linux

And how exactly would you run any of these on a text mode OS? You're probably better of with Windows or Linux.
 
I mean, there were games etc. on DOS, but the software would have to take care of initializing the graphics mode. Pretty sure no modern software (that is not a game) does that. Also there's the whole 640K lower memory limitation of DOS... Seriously, use Linux.

windows out of question but something like tinycore might work

As someone who lived through the DOS era, not something I would do voluntarily. Specialized "autoexec.bat" for certain games, just to have enough of that precious 640K lower memory available for that one game, no thanks And Windows 3.1, yay.
 
If you want to do some retro-gaming, I guess go for it, but if you want to watch videos etc. I'd rather go for a Linux distro with a lightweight desktop.

vert similar to my first pc accept i had ram and for dos you'd better go with vm  and the only thing that machine can run is win xp or tinycore 

What are you planning to do with the Machine?
With a Pentium III and 128MB of ram I would probably run Windows 95 or 98, however if your really set on DOS I would probably go for FreeDOS personally which is compatible with DOS applications.
 
FreeDOS
https://www.freedos.org
 
FreeDOS Software
https://www.freedos.org/software/
 
There are some archives floating around for DOS Applications, however it may be against the forums policy for me to share those.

Expecting DOS to do modern workloads is not giving you the DOS experience you're looking for.
 
Seriously. A Pentium III cannot decode HD Video. I've tried.

You have to enable the multi-GPU option in BIOS. By default, the iGPU is disabled, if you have a dGPU installed. After you've enabled that option in BIOS, you'll have both GPUs available. I have both a GTX 1080 and Intel iGPU enabled myself.

yes you can
 
enable iGPU in the BIOS

I also suggest he can use something like Nova Launcher to change the look.

If you want a modern phone android and iOS are your only options, iPhones can be had for around $450 so they arent that expensive. I would also suggest trying out other android phones, I dont know what you used previously but there is a big difference in the experiences offered by samsung and oneplus for example

If you don't want Android nor iOS stay with the Nokia.

Do not get a BlackBerry OS phone.  I'm not saying that lightly or as a matter of opinion.  BlackBerry is shutting down its app store at the end of 2019.  If you buy a phone you'll probably be limited to the apps it comes with, and any you do download probably aren't getting updates in the last few weeks of the app store's existence.  You really will be throwing your money away.
 
If you don't want to buy Android, you're buying an iPhone -- the market is just that two-sided right now.  You could try for a refurbished iPhone 8 if a new model is too pricey.  There's also rumors of an iPhone 8-like "iPhone SE 2" (probably not the actual name) around March 2020 or so that would modernize things while keeping the price down to something like $399 US.  Whichever one you get, the performance will be more than enough for what you're looking to do.

specter and meltdown are exploits for x86 Chips not ARM chips. you’re only real options are iphone or android since even blackberry uses android now.

By the looks of it, I don’t think you can change this one, only reason this has been done is to allow for clearance tolerances within the case itself. You could however try a custom flat back plate but you’d have to work out if you have space etc. It would be a custom job. 

Celeron is a marketing position that covers multiple generations. The cores are Braswell, which are a continuation of the Atom line.

The problem with the N3060 isn't that it is dual core, but those are Atom cores. Anything that isn't hardware accelerated is going to be slow on those.
At least this is a Skylake CPU, so they are much stronger than the ones in the N3060. Clock is still on the low side, but this is expected as they are optimised for very low power usage.

You can also use an Android TV Box, that are optimized for media consumption.
They use around 10watt at most. Plug in a mouse and a keyboard and voila, a computer.

I got a laptop with that processor and I can easily say, you wont be having any pleasant experience with anything dual core nowadays. 
Windows 10: nope.
Chrome: nope.
Office: Yes, but its not particularly fast with function heavy documents.
Media: as long as its H264 (so that you can use HW acceleration) it can play up to 1080^30.
Anything non windows: it works and all but its reaaaaaaaaally slow (I used ubuntu on it for couple of months then went back to windows 10 and it was faster.), you would have to run distros that are light on resources, especially GPU and CPU.
Gaming: dont even bother.