bad ami bios 1994

January 30, 2013 at 04:11:55
Specs: Dos 5.0

old 486 was working OK and not nothing when powered up. Key board will flash and that's it. Oh another thing is battery is old and week. Like to find out if a bios will go belly up and if a swap will make the machine do somethings.

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January 30, 2013 at 04:54:18

BIOS generally don't go "belly up". And even if the CMOS battery is bad, the only thing that will happen is the BIOS settings will reset each time the system is powered off, then when you power back up, the date will be 1994. How about a more detailed explanation? Are there any beeps? Do you hear the fans spinning up? Have you made any hardware changes? I'm guessing it's your power supply.

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January 30, 2013 at 11:57:09

and if a swap will make the machine do somethings

If you swap what?

If you mean the battery then the answer is that replacing it will do no harm. I'm none to sure it will help though.

Always pop back and let us know the outcome - thanks

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January 30, 2013 at 17:26:08

On old 486 boards, they usually used a Dallas battery chip which was soldered to the motherboard and was not replaceable. Some boards used several watch type batteries welded in series. Some higher end boards had a connector which you could connect an external battery pack to.

Look for a black chip about one inch long, 3/8ths inch tall and 3/8ths inch wide and says Dallas on the top, that will be your CMOS/BIOS battery. If you don't see that, look for a stack of watch size batteries stacked together. Now look for a two pin connector near it. If you have one it will be labeled for an external battery.

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January 30, 2013 at 17:46:02

There's a lot of variation in batteries - my old AST 486 had just one, coin sized.

Always pop back and let us know the outcome - thanks

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