Honestly have never seen a DTK 486, we had stacks of 386sx DTKs of various clock speeds at every school and business around here, 286’s were always NCRs

Strange that they have used a 5.25 rather then the 3.5 bay for the FDD, Maybe they are like me and never liked mounting the drive sideways.
Checking the CD-ROM model will confirm its interface.
PAS16 is indeed a fun little card to play round with, High Treason did a video on it that convinced me they aren't worth the asking price on ebay, but still hoping to find one on the cheap one day
https://youtu.be/sdphd742Oqs

I come from a DTK town. They were especially popular at the universities and high schools. I saw everything from XT to 486.
My own DTK 486 had the 3.5" floppy drive in the vertical bay, not in an adapter (from the factory).
My guess is that while they were transitioning to the baby AT cases, they probably already had a lot of grey 5.25" and 3.5" drives with adapter from their 286s that they wanted to get rid of.
Who's to say what's in there is original anyway. It looks like somebody has been messing around.

What is the model on the motherboard?

Anonymous Coward wrote on 2020-09-10, 08:04:

I come from a DTK town. They were especially popular at the universities and high schools. I saw everything from XT to 486. My […]
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I come from a DTK town. They were especially popular at the universities and high schools. I saw everything from XT to 486.
My own DTK 486 had the 3.5" floppy drive in the vertical bay, not in an adapter (from the factory).
My guess is that while they were transitioning to the baby AT cases, they probably already had a lot of grey 5.25" and 3.5" drives with adapter from their 286s that they wanted to get rid of.
Who's to say what's in there is original anyway. It looks like somebody has been messing around.

What is the model on the motherboard?

Interesting you say that because it has this metal plate on the back. I'll check the mother board..

If the VGA card is oak, it's probably an ISA motherboard (without local bus). I would guess PKM-0031Y or a derivative.

Except for the hard drive that appears to be a 1993 computer.

I doubt the CD-ROM drive or sound card were original from the factory. The mismatched drives are not presentable for retail sale. I would also guess the 3.5" drive has been replaced. It's possible all of this was done by the original owner, but we haven't seen inside yet.

Here are some pics without taking anything apart. The CD has a date of 1993 on it and the HDD a 1997 date.

A couple more

I can't see the entire board. But it looks like a PMK 0031Y. Interestingly it uses a DTK BIOS. This is the first time I've seen one with a DTK BIOS. They most often come with AMI HIFLEX BIOS.

Anonymous, you must indeed be the computer whisperer to identify that motherboard from these pictures!

The trick only works if I've owned the board for at least 25 years.

Still, it could be a slightly different model. I know there is one fairly close that has a Weitek socket instead of a 487SX socket, but the exact name escapes me.
Perhaps "FEAT-3331"?
http://www.uncreativelabs.de/th99/m/C-D/33100.htm

Your board has a sticker that has "FEAT5030" printed on it.
TH99 has a board labelled FEAT 5031. I think FEAT is actually the model of the PC. The real board model name should be PKM-5031Y (which I think is just PKM 0031Y with slightly different equipment). So, it's possible that your board should be an older version not listed on TH99....perhaps a PKM-0030Y?

DTK wasn't just any old white box PC vendor. They actually made their own shit, and they made TONNES of it. I wish I had some documentation to decipher their model names.

If we use PKM-0031Y as an example, I believe the 'M' stands for motherboard. Not sure what the 'P' and 'K' are, but the 00 is a place holder for the operating speed of the unit sold. So 3331Y is a 33MHz version, and 5031Y is the 50MHz version. They usually slap a sticker over base model name after the CPU has been installed. The last letter in the code is the manufacturer of the chipset. Y is for Symphony. S is for SiS. P is OPTi. C is for C&T. V is for VLSI. I is probably intel....and I think no letter indicates discrete logic (no chipset).

There is a Symphony chip on the board... THANK YOU for the link to the board information!!!