I came into possession of a 75MHz FSB Cyrix mII 300GP 75MHz. I'm not comfortable with overclocking the PCI/IDE, so I was wondering if I could just use 66MHz FSB but up the multiplier to 3.5x as on the regular mII chips?
Retronautics: A digital gallery of my retro computers, hardware and projects.
Cyrix MII processors are FSB and Multiplier unlocked.
Just set whatever parameters you want.
wrote:Cyrix MII processors are FSB and Multiplier unlocked.
Just set whatever parameters you want.
Excellent, many thanks.
Retronautics: A digital gallery of my retro computers, hardware and projects.
3.5x works, but if you try to use 4x, many socket 7 motherboards won't work with this unless the BIOS is modded to specifically support 4x. Most super socket 7 boards should be fine though.
Plan your life wisely, you'll be dead before you know it.
wrote:3.5x works, but if you try to use 4x, many socket 7 motherboards won't work with this unless the BIOS is modded to specifically support 4x. Most super socket 7 boards should be fine though.
I found your last year's post about getting 4x multiplier on MII. The databooks I could find only list inputs from CLKMUL0 and CLKMUL1. Could you please share your version of the MII databook? Thanks.
These are just a few of the documents for the MII.
Plan your life wisely, you'll be dead before you know it.
I find the discussion on trace capacitance, trace reflections, restive dampening, and diode clamping interesting. It is on the first few pages of CyrixMII_-_MII_100MHz_Bus_Design.pdf
Plan your life wisely, you'll be dead before you know it.
wrote:These are just a few of the documents for the MII.
Thanks a lot! So CLKMUL2 is added from Rev. 2.3.1 onward...
