magicmanred wrote on 2025-07-03, 03:44:Jan, […]
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Chkcpu wrote on 2025-06-25, 18:45:Hi -M, […]
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Chkcpu wrote on 2025-06-16, 10:23:
Edit: I've located the buggy code in the V3.0SL BIOS and found it in the previous V2.0SL BIOS as well. Because my patch J.1 and J.2 versions are based on the V3.0SL, they have this nasty bug as well. So don't use the Manual 2.0V setting on any of these BIOS version!!
Using the 2.1V and higher settings is fine though.
Jan.
Hi -M,
I believe I’ve fixed this nasty 2.0V bug, and I just send you a PM with a new patched BIOS to test.
Hopefully this fixes most of the problems you have with this board. 😉
Jan
Jan,
Looks like it worked!
I am able to run K6 2+ at 600mhz at 2v
I was even able to pop in my K6 III+ 550 @ 2v
Overclocked to 600mhz @ 2.1v and tested 2.2v as well.
Some weird behavior happens when I spam the Del key to enter BIOS (it restarts) unless I wait until the ram finishes its checking/testing. But otherwise everything is A-OK!
You rock!
That BIOS should definitely go on TRW for future users!
-M
-M,
This is great news!! 😀
A few months back, while working on this BIOS for another Vogons member, I identified another (unrelated) Vcore bug that could cause an initial 2.7V Vcore on K6-2+/III+ CPUs only, when the SpeedEasy Core Voltage selection was left on Auto after a CPU change.
I fixed this bug then by lowering the initial Vcore on the K6plus to 2.2V, just as for the K6-2, and of course this fix is in your J2.3 test BIOS as well.
All and all, with two SpeedEasy Vcore bugs that needed fixing, I find QDI’s work on this Advance III BIOS less than stellar. In contrast, the work they did on their earlier i430TX Titanium SpeedEasy BIOSes was outstanding!
If you have the time to do some Vcore measurements, I very much like to know what values you find. In view of the above, the ultimate SpeedEasy Vcore test would be:
- Setup the board with your Pentium MMX 200 at the correct speed and voltage (either Auto or Manual) and measure Vcore
- Then install the K6-2+ and measure the initial Vcore when powering up and after changing SpeedEasy to Manual 2.0V.
Note that entering the BIOS Setup right at the first boot-up after a CPU change and making the necessary SpeedEasy settings, a “CPU has been changed, Enter BIOS Setup” message may still be displayed after the first reboot.
When entering SpeedEasy again and setting the required values, all will be well after the second reboot.
This two-step Setup after a CPU change is not uncommon and will specifically be seen when the CMOS contents was lost due to a CMOS Reset or a flat battery.
However, during this whole process the Vcore should stay within limits, for any supported CPU model, after a CPU change.
Cheers, Jan
