286 keeps time after power down \ VOGONS

286 keeps time after power down

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First post, by therevisiona

Posted on 2020-05-19, 11:19

therevisiona Offline

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Rank: Newbie
Posts: 67
Joined: 2020-05-15, 15:11
Location: Czech Republic

Hello, I am building a 286 (Build log will be coming soon). It was last powered on 2 days ago and does not have a CMOS battery (removed the original one because it was leaking). Today I powerd it on and it kept the time and settings. Can I ask, how is this possible?

Reply 1 of 2, by derSammler

Posted on 2020-05-19, 11:26

derSammler Offline

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Rank: l33t
Posts: 3886
Joined: 2017-04-14, 11:30

It kept the time, but the time did not advance, correct?

The CMOS data can stay powered by the caps on the board for some time. The RTC isn't working without a battery, however, so the time stored in the CMOS is frozen.

Reply 2 of 2, by therevisiona

Posted on 2020-05-19, 11:43

therevisiona Offline

Rank Newbie

Rank: Newbie
Posts: 67
Joined: 2020-05-15, 15:11
Location: Czech Republic

derSammler wrote on 2020-05-19, 11:26:

It kept the time, but the time did not advance, correct?

The CMOS data can stay powered by the caps on the board for some time. The RTC isn't working without a battery, however, so the time stored in the CMOS is frozen.

Ah, okay. Yes the time did not advance

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