First post, by lazibayer
- Rank
- Oldbie
I like collecting information on clock generators since they tell you if there are hidden jumper settings, but I couldn't find such pool of data so I will start my own. I will start with a few and update whenever I spot a clock generator on the web. I like Socket 1~7 boards since I know little about older boards and I don't like the jumper-less newer boards. Everyone is welcome to post the model of clock generator on your motherboards.
So I will start with the famous ASUS P5A-B (Rev. 1.04)
Clock generator: ICS9148BF-53
Everyone knows that it has hidden jumper settings for 125 and 133MHz, but actually it can do more than that 😎
FIC 486-GAC-2
Clock generator: VT8225N
The board only prints 25 and 33MHz, but the chip is able to range from 2 to 50MHz 🤣
And it actually boots at 2MHz!
Boards with VIA VT82C496G / VT82C406MV chipset
The clock generator is built inside the chipset and the control logic is a little complicated. It takes 7 bits to decide the CPU clock and another 4 bits to decide ISA clock. A board may not have that many jumpers but you can enumerate all the possibilities if you know how to manipulate the chip's registers!