Win3x.Org

The AMI BIOS was not added correctly (cannot be downloaded) and manufacturer should be AMI, not A-Trend.

That's great! A few more improvements:

Title: AQUARIUS SYSTEMS, INC. MB-4D33NR/50NR
Expansion slots: 3x 32-bit VLB
Also known as: <remove>

The name of the board is MB-4D33NR/50NR, it is not known other than that (see photo).

That makes perfect sense, never knew that. UH19 is like the successor to TH99 . Great work!
Perhaps a merge of http://www.win3x.org/uh19/motherboard/show/6814 and http://www.win3x.org/uh19/motherboard/show/5451 (Manual "MTL Jumper manual" link is broken) is appropriate?

No, I mean the author of https://stason.org/TULARC/pc/motherboards. The motherboard is currently listed as unidentified on that site.

It is possible that there are some minor differences between revisions of the board. For example, my board has tantalum capacitors whereas the one on the photo has electrolytic capacitors. Some boards might even have the missing 72-pin SIMM socket installed. There is room for a barrel battery, I agr...

To improve the content, submit a thread by filling in fields you want to improve. ================================= URL on win3x.org/uh19: http://www.win3x.org/uh19/motherboard/show/6814 Maximum supported RAM: 64 MB Supported FSB speeds: 25MHz, 33MHz, 40MHz, 50MHz Manual(s): https://stason.org/TULAR...

To improve the content, submit a thread by filling in fields you want to improve. ================================= URL on win3x.org/uh19: http://www.win3x.org/uh19/motherboard/show/8299 Motherboard BIOS: 40-0105-428003-00101111-080893-UMC491F, version INV 1.2 94.4.15 URL: http://sannata.ru/bios/486...

To improve the content, submit a thread by filling in fields you want to improve. ================================= URL on win3x.org/uh19: http://www.win3x.org/uh19/motherboard/show/4648 Motherboard BIOS: 40-0100-001102-00101111-080893-SIS461, rev MG1 URL: https://frapex.home.xs4all.nl/bios/SOYO-486...

To improve the content, submit a thread by filling in fields you want to improve. ================================= URL on win3x.org/uh19: http://www.win3x.org/uh19/motherboard/show/1161 Motherboard BIOS: 31-0100-001190-00101111-121291-MXIC / MXIC-305/306 URL: https://frapex.home.xs4all.nl/bios/C386...