First post, by jesolo
I have this motherboard: https://theretroweb.com/motherboards/s/jetway-j-402b.
Unfortunately, the BIOS ROM on my motherboard became corrupted and I was lucky enough to obtain another one from a fellow user here on Vogons (this is also the version that was uploaded to the Retroweb) - https://theretroweb.com/motherboard/bios/jetw … 3f929780407.zip
The motherboard is working fine now but, I have the following issue (and I don't recall having this issue prior to the original BIOS becoming corrupt):
The motherboard has both a 2-pin header for a turbo LED and a 2-pin header for a turbo switch.
When I short the turbo switch (provided that I connect the turbo LED the right way around), the LED light comes on (in other words, it will generate a 5V signal to the LED pin when the turbo switch header is shorted - this has been confirmed with my multimeter as well).
Unfortunately, when the turbo switch header is shorted, the PC actually runs in non-turbo (normal) mode. Obviously, I want the turbo LED to come on when the PC is running in turbo mode.
I've tried setting the system boot up speed to high in the CMOS setup, switching the connectors around but, there was no change.
Please note that, in order to understand how the motherboard functions and in which circumstances it will turn on the turbo LED, I actually bypassed the turbo switch in the PC case and shorted the 2-pin turbo header directly with a jumper.
I tried looking for a MR BIOS replacement but, I wasn't able to find a version that would work properly on my motherboard. The closest one I could track down was OPTI4BH but, the turbo switch has no impact when I push the switch or short the header (Ctrl+Alt++ & Ctrl+Alt+- does work but, the LED just remains on, which is not what I want).
Does the above something to do with the BIOS on the motherboard?
If that is the case, can one control how the turbo functionality operates on the motherboard via the BIOS so that, instead of the PC running in normal mode when the turbo switch header is shorted it actually runs in turbo mode when the turbo switch header is shorted? Would it be possible then to re-program the current BIOS revision to "tell" the motherboard to put the PC in turbo mode when the turbo header is shorted?