RTC runs the clock from internal 32KHz crystal when off. When ON and in DOS time is run by system timer (8254 PIT https://wiki.osdev.org/Programmable_Interval_Timer using bus/~14MHz clock). I dont know which one is used on the BIOS screen.

broken crystal is a likely culprit. that tiny metal tubes... I forget what frequency it was... 31k or something i think.

edit: https://youtu.be/koL3T5OAlIk?t=406

weedeewee wrote on 2024-10-20, 17:18:

broken crystal is a likely culprit. that tiny metal tubes... I forget what frequency it was... 31k or something i think.

edit: https://youtu.be/koL3T5OAlIk?t=406

Thanks for your replies!

Do you mean the crystal of the RTC?

JF_Sebastian wrote on 2024-10-20, 18:25:

weedeewee wrote on 2024-10-20, 17:18:

broken crystal is a likely culprit. that tiny metal tubes... I forget what frequency it was... 31k or something i think.

edit: https://youtu.be/koL3T5OAlIk?t=406

Thanks for your replies!

Do you mean the crystal of the RTC?

yes. please watch the video.

Ok. Thank you for your quick help!

Greetings
JF

On this board 32KHz crystal is blobbed together with bios battery in the Dallas RTC clock chip, PIT timer is inside Intel 82371SB (PIIX3) southbridge and driven by ~14MHz buffered by ICS9159 clock gen chip.

rasz_pl wrote on 2024-10-20, 19:11:

On this board 32KHz crystal is blobbed together with bios battery in the Dallas RTC clock chip, PIT timer is inside Intel 82371SB (PIIX3) southbridge and driven by ~14MHz buffered by ICS9159 clock gen chip.

Well, when you're right, you're right.

JF_Sebastian When you go into the bios setup, and watch the time there. Does it count the seconds normally or not ?