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486 RTC/Battery

You might want to try to mod it to connect a normal CR2032 to the internal pins. It's not really difficult if you have some practice with a dremel tool (and then soldering iron). There are many tutorials online on how to do it. Basically you dremel on the side where the battery pins are until you expose them, then dremel a bit toward the inside of the brick to further expose the contacts to the internal battery. After you break both positive and negative connections to the battery you can connect a battery holder to glue ontop of the brick and voilà. Here's an example of tutorial: http://www.mcamafia.de/mcapage0/dsrework.htm

If you have to desolder the original brick mind to not damage the board and then install a socket instead of just resoldering it directly.

Here's few pictures of my mod: http://imgur.com/a/UtnZ1
 
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I had Pionex 486 computer with one of those chips, and I replaced it with the Dallas 12887A chip. Fit perfectly and didn't have to make any modifications to the system, and the chip itself is cheap. It wouldn't post or beep before, installed the chip, and it booted.

I'm not sure if this is the case with other computers, but I accidentally ordered the Dallas 1287 chip and installed it when I read it was compatible with 12887A. In my case it would not work at all, CMOS settings still would not be saved, but this time it would post but not boot. So make sure you order the Dallas 12887A chip.

http://www.ebay.com/itm/1PCS-IC-MAX...882074?hash=item3f56f5b1da:g:NRAAAOSwAYtWML1v
 
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