>early 1990's

all datecodes point at 1989, quite early for Taiwan clones, nice one.

https://theretroweb.com/motherboards/s/unknown-hsm-386-at
Might even be compatible with https://github.com/raszpl/386RC-16
Can you dump bios?

Hi,

Thank you for the quick response and the links.

I purchased this board new, I don't remember the exact date, just that it was around 1990. After 45+ years, I have also lost docs, accessories etc. , the board is all I have from the original system.

The board starts, runs DOS, and is stable. Do you have a recommendation for a software utility to dump the bios?

Thanks!

https://www.brutman.com/PCjr/downloads/pcjrcart.zip pcjrcart.zip "Cartridge and ROM BIOS extension utility; finds and writes to disk. Version 1.1"
there is also https://theretroweb.com/drivers/1831 "DumpAT (BIOS dumping utility)" but "This will generate a 1MB file with the BIOS image at the bottom. Use whatever hex editor to cut the first empty bytes." suggests it saves whole 1MB of ram 😐

This isn't really of any help, but I found one of the same board listed on a Taiwanese marketplace site:
https://www.ruten.com.tw/item/21440371637468/

No useful information in the listing, though. 🙁

Similar naming style ( BI-025C HT12 286 ) on this board might give a clue to the manufacturer... https://theretroweb.com/motherboards/s/tidalp … i-025c-ht12-286

ebay listing from 2005:

"Vintage 386 Motherboard AMI Chipset W Processor And Ram BI-033 386, Tested"

@rasz_pl: thanks, I'll try these, after I get the file, do you want me to post it here? Do you know what to look for in it?
@HwAoRrDk: Yes, I think thats been there for a few years now, even translating the page into english does not get any better info.
@PC Hoarder Patrol: Yes, that board does look similar, the BIOS string does have a different 4 digit manufacturer code though.
@TELVM: Yes that is an exact match, hadn't seen that one before.

Thank you to all for the research!

PC Hoarder Patrol wrote on 2026-07-08, 20:17:

Similar naming style ( BI-025C HT12 286 ) on this board might give a clue to the manufacturer... https://theretroweb.com/motherboards/s/tidalp … i-025c-ht12-286

Now thats a great find. 'BI-' prefix also appears on some IO cards of same vintage, sadly all marked UNKNOWN too https://theretroweb.com/expansioncards?page=1 … ge=24&name=BI-0

I have to wonder where did the HSM in https://theretroweb.com/motherboards/s/unknown-hsm-386-at came from in the first place seeing the only data for this entry are two low quality scans from a newspaper.

scoove wrote on 2026-07-08, 21:55:

@rasz_pl: thanks, I'll try these, after I get the file, do you want me to post it here? Do you know what to look for in it?

Uploading here would be great. Ill try comparing with some other boards. That non listed 1030 Manufacturer code makes me wonder if it isnt a case of unauthorized rip off by a small OEM manufacturer.

Closest looking board on TRW - https://theretroweb.com/motherboards/s/ecs-386a
ECS 386A

Hi,

Please see the attached files for the ROM dumps.

C0000000.txt -> Cirrus Logic VGA Adapter
D0000000.txt -> XTIDE HDD adapter
D8000000.txt -> texELEC floppy controller
SYSTEM.txt -> System

Thanks!

Thank you.
Last 64KB of SYSTEM.txt is a working AMI Plus BIOS https://wiki.softhistory.org/wiki/AMI_Plus_BIOS
Will disassemble and compare to some other boards later.