I love those mATX builds! This is the motherboard from my current P3 build, an Acorp 6VIA82P:
https://web.archive.org/web/20200830143526/ht … _i.php?ic=20732
I chose it specifically because of it's small size and wide compatibility due to having ISA, PCI, and AGP. Retro PCs tend to be large affairs, so to save room I needed a board that would fit into this case:
https://web.archive.org/web/20200830160823/ht … s/bk-series/USA
The IN-WIN Development Inc mATX Desktop Case is small enough to fit inside an Ikea shelving cube [323 x 140 x 322 mm (12.7” x 5.5” x 12.7”)], and while it makes for a snug size I managed to fit a lot of good hardware in my build:
*** SYSTEM SPECS ***
Motherboard: Acorp 6VIA82P mATX: (1) 2x AGP, (3) 32-bit PCI, (1) ISA
CPU: Intel Pentium III 800EB […]
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*** SYSTEM SPECS ***
Motherboard: Acorp 6VIA82P mATX: (1) 2x AGP, (3) 32-bit PCI, (1) ISA
CPU: Intel Pentium III 800EB Mhz
RAM: 512MB PC133 CL2
Ports: PPA Int'l PCI Combo Card SATA, USB 2.0 & FireWire (1325)
HDD: 1x 2GB DOM, 1x 127GB HDD, 1x 4GB CF
CDROM: Plextor PX-708A
Floppy: 1.44MB
Video: Voodoo3 3000 AGP
Sound: Creative Sound Blaster AWE64 Gold w/28MB RAM
Diamond MonsterSound MX300 w/Yamaha DB50XG
Roland Sound Canvas SC-55
Roland CM-32L emulation via MUNT on external PC
On the DOM I run MS-DOS 6.22, and on the HDD I have Windows Me installed, since it gives me USB support out of the box and a more stable kernel. I switch between the two at boot via System Commander 7.0. My 4GB CF card I use to host CD images, which I mount via the last windows 9x release of Daemon tools.
The case was packed full, as you can imagine, even with rounded IDE cables to improve airflow. I had to cut a four inch hole over the card slots to mount an external fan to keep it from overheating. I'm traveling at the moment, so no pix of the build available until I return.
Overall I am quite happy with it. I can slow the build down and disable caches no problem to run games as old as Space Quest III and Indiana Jones and the Fate of Atlantis. Or I can run late 90s games with full A3D support like Thief: The Dark Project.
Good luck with your build!
EDIT: I've recently acquired an MT-32 as well but it is not presently hooked up to this build.