|There is no SMT mboard maker that I know of.|
Some mboards that were in Dell systems have SMT printed on them - in that case it probably stands for Small Micro Tower.
If the mboard was in a brand name system, it may still have a stuck on label on it that has the brand name's part number on it - that can be useful to search with if you find that. Sometimes that label is on the top of a port .
If the mboard boots (posts), if you supply the bios string, we can probably find info about it.
The bios string is usually a long string of numbers/letters at the bottom of the first black screen as you boot your computer - it often begins with a date - usually you can press the Pause key to read it and copy it down.
Press any key but Pause to continue booting.
It could also be higher up the screen under or beside the bios version line, e.g. under or beside Award or AMI or Phoenix...
Post that bios string here, and include any dashes, etc.
Please make sure you copied it right. Most Award and AMI Bios strings do not have spaces. Newer Phoenix bios strings, based most often on those for Intel mboards, are often like so: xxxxxxxx.xxx.xxxxxxxxx
If the mboard is not in a working system.....
You could try looking in this mirror of the Total Hardware 99 web site.
This mirror has the full archive - mboard diagrams as well as text descriptions.
You could try looking at the two sets of Pics of the Socket 2 and 3 mboards, click on ones that look the same or very similar.
The text lists have several listings that mention Ali main chipsets - you could try searching the lists for: Ali.
However,the main chipsets of many of them are not identified.
The Total Hardware archive has few if any mboards that were used only for brand name systems.