ASRock H110M-STX Boardview or Schematic request

[Herbs n spices]

I have an ASRock Deskmini with the H110M-STX rev 1.03 motherboard. I'd like to make some modifications so if anybody can share the boardview that would be greatly appreciated! Thank you in advance. I'm also looking for any LGA3647 boardviews.

[Rimlen]

Only 1.02 revision.

[Herbs n spices]

Thank you! I doubt the difference will hinder me. I intend to add the COM port to this unit, and support for 8th/9th gen CPUs. The COM port hardware was only added to the H110M-STX/COM version, although the physical boards are the same. I should be able to simply populate the board with an ST3243 and capacitors and enable the function in the UEFI. I will update this thread with my progress.

[Herbs n spices]

Success! I first used a CH341A v1.7 to save the original UEFI, and used Coffeetime v0.99 to transfer the Intel ethernet MAC address to the stock H110M-STX/COM ROM downloaded from the Deskmini H110 page. A hexeditor would have worked fine for that, but I also wanted to update the microcodes to the latest versions on platomov's database and add coffeelake CPU support. I then flashed the new UEFI with the CH341A since version checks prevented AFUwinGUI or the onboard BIOS updater from working.

On to the hardware: I scavenged a MAX3243CAI and the 3x 0.47uF and 1x 0.1uF capacitors from an old laptop motherboard, and the serial port I soldered directly to the H110-STX since I didn't have a suitable connector. A modern ST3243E would have been faster and one size smaller parts would have been proper, but I used what I had on hand.

I also soldered a little jumper to short PC114 and cut 2 pins out of the socket to allow Coffeelake CPUs to work.

After all that I reassembled the PC, booted it up, and voila! I was able to connect my RS-232 devices right away.

[Rimlen]

Good work!