I don't know what model it is, from the BIOS it seems to be produced by SERITECH ENTERPRISE CO., LTD, but it is very similar to the GIGABYTE GA-386UM 33/40, on the MB there is a written TK-82C390A-4N-D11SE, I don't know if from this info you can understand exactly what it is.
A little while ago I ran your program on the 486-DX2-66 VLB, obviously I created the two files as you suggested, it was easy because I have a CF-IDE adapter instead of the HD.
The CPU I remembered was IT'S or ST, in fact it is, even if it is practically a Cyrix with different screen printing.
The MB instead is PCCHIPS but the right model is M912 (I didn't remember well), it has fake cache chips although when the BIOS starts it detects the presence of 256KB (in reality they are 0KB therefore), I installed a total of 20MB of RAM , 16MB is two 72PIN SIMMs plus four 1MB 30PIN SIMMs.
I have two floppy drives one 3.5 "1.44MB and the other 5.25" should be 1.2MB, in fact I don't know if that's the case, the drive is a TEAC FD-55GFR.
I attach the zipped files and some screenshots.
AMD 286-16 287-10 4MB HD 45MB VGA 256KB
AMD 386DX-40 Intel 387 8MB HD 81MB VGA 256KB
Cyrix 486DLC-40 IIT387-40 8MB VGA 512KB
AMD 5X86-133 16MB VGA VLB CL5428 2MB and many others
AMD K62+ 550 SOYO 5EMA+ and many others
AST Pentium Pro 200 MHz L2 256KB