First post, by retro games 100
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- l33t
Edit: Solved! Please see h-a-l-9000's advice below this post. 😀
I am testing a 286 mobo. On this mobo there is a model code, and it reads: BI-025C HT12 286. I have found a diagram of this mobo on Stason. It is here. However, the jumper label numbers on this webpage do not match up with the jumper label numbers on the mainboard. For example, a jumper on that Stason webpage will say "JP7", but on my board it will be "JP4". The jumpers on the diagram, and on my board are in the same location, it's just that the jumper number labels are not the same.
Unfortunately, the mainboard battery was leaking. I can see acid on the external battery header pins, and also inside the keyboard chip socket. I removed the battery. It was very easy to remove the battery, because it just "fell off" as I pushed it. I tried attaching an external battery to the externa battery header pins, but these pins have got "blue fur" on them, because of the battery acid. So, I decided to attach the external battery to the cleaner looking solder spots on the underside of the mainboard. I attached the external battery wires to the external battery header pin solder spots.
When I switch on power, I always get the BIOS POST error message of "CMOS INOPERATIONAL. SYSTEM HALTED." Is this because of a battery related problem? I have tried 4 different memory configurations. I got these memory configurations from that Stason webpage. Currently, I have no SIMMs installed, and I only have the mainboard's BANK 0 memory chips installed.
Any ideas please people? Thanks a lot for any help! 😀 BTW, I am testing this mainboard with just a 16-bit VGA card. I have not attached any other piece of hardware to mainboard, such as an IO controller, etc.