Solution:

There is a way to extract out the BIOS information by the software. After system boot up, the BIOS informaiton will be loaded in the address F000:E0C0 to F000:E0F0. If you use DOS debug command : DEBUG -d F000:E0C0 You will see the BIOS version information is located in this region. You can use C or Basic programming to check the BIOS version. Because rev. 1.80 represent rev. B but rev. 1.75 represent rev. A board so you can recognize the board version. Of cause a good way to recognize is to check the BIOS version by inspacting the BIOS message information on the moniter.