- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
Are Intel desktop bios chips in a High Impedance mode during following three conditions?
- The motherboard is not powered.
- The motherboard has ATX power, but the board has power, but is not turned to boot.
- The motherboard is powered and booted.
Thank you.
Link Copied
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
What is a high impedence state?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
Sorry for the delay in responding.
My understanding is that if the bios chip is in a High Impedance mode, then one can reflash the bios or read the bios by using a SPI programmer along with a eight pin clamp on the bios.
If the chip is in a high impedance state any external changes to it would not be affected by the MB circuits.
Otherwise to read or update the bios, the chip needs to be removed from the MB in order to read or reflash it.
I was thinking about modifying the bios so that it could boot from a Nvme. Do a search for Fernando's Win-Raid Forum, if you are interested.
Since Intel didn't release any Spectre/Meldown patches for my MB, I have decided to move to a new MB.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
"Since Intel didn't release any Spectre/Meldown patches for my MB, I have decided to move to a new MB."
Wise choice.
Doc

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page