I have no turbo button on this case...it's too new..it just has a tutbo led indicator
A case with a turbo LED but no turbo switch to go with it. Odd! Must have been produced just at the time when the 'turbo' functionality was being phased out. I guess the LED made users happy that their machine was running as fast as it could.
I've put a jumper on the turbo pins on the motherboard so it's in turbo mode all of the time
Note that on some motherboards, shorting the turbo pins takes the motherboard out of turbo mode.
... these 386 motherboard go down to 4-8mhz XT mode when they're in non turbo.
I try to avoid assumptions. Of course, if the motherboard is indeed in turbo mode, removing the turbo jumper will see the performance drop even further. It's a quick test to rule it out altogether.
... and the BIOS settings were lost so my problem now is that I have no clue on how to set it up for max performance.
SysInfo is showing your 386-33 as a "80386DX 25Mhz". The BIOS can determine the "80386DX" bit quite easily. The BIOS arrives at the "25Mhz" figure by timing how long certain 60386 instructions take to execute. So we can say with good certainty that your CPU is being provided with a 25MHz clock, instead of a 33Mhz clock.
The standard method of generating the CPU clock on 386 motherboard is to divide the oscillator by 2. So on my 386-40 boards, I see an 80Mhz oscillator ("tin can"). I have another 386 board that according to the manual will take either a 386-16 or 386-20 CPU. On that board are two oscillators, 32Mhz and 40Mhz, and you change the position of a jumper (selects which oscillator is used) according to which of the two CPUs is installed.
Do you have a 66Mhz oscillator on your board?
By the way. Regarding the three 'clock' related items shown in the middle of the second BIOS screen shot. The manual for one of my 386 boards shows that the board has the same BIOS (exactly the same screens) as yours. For those three 'clock' items, the manual states, "It is not user adjustable". The three values shown in the screen shot match what is shown in the manual.
The values in the third screen shot of yours (chipset registers) differs slightly from what is in my manual, but that could be because of different motherboard design.
In any case, the procedure shown in the manual to "clear the CMOS RAM" is to power on whilst pressing the INSERT key, continuing to hold down the key until the "screen display appears".
