Jumper description are likely linked in this post: Re: SIS 486SOM Socket 3 System Board

ye same i have, found on te link i forgot to add 🤣
https://theretroweb.com/motherboards/s/chaint … ch-4som2.1-m102
but when i try "modify" this from working with that am5x86 cpu to a normal 486dx2-66, i wont start so im doing something wrong and from those bad pictures i dont seem to hit it correctly.. thats why i hope someone else has a working 486dx2 and can share settings with me..

ia2115 wrote on 2022-10-02, 14:49:

ye same i have, found on te link i forgot to add 🤣
https://theretroweb.com/motherboards/s/chaint … ch-4som2.1-m102
but when i try "modify" this from working with that am5x86 cpu to a normal 486dx2-66, i wont start so im doing something wrong and from those bad pictures i dont seem to hit it correctly.. thats why i hope someone else has a working 486dx2 and can share settings with me..

Did you remember to set the voltage to 5V (JP32-JP34 need to be closed, JP31 needs to be pulled)? J2 to J7 are jumper blocks, and you need to open/close all of the positions. So to get from 5x86 (WB) to DX2, move all the jumpers from J4 to J3, and all the jumpers from J7 to J6.

ia2115 wrote on 2022-10-02, 14:49:

ye same i have, found on te link i forgot to add 🤣
https://theretroweb.com/motherboards/s/chaint … ch-4som2.1-m102
but when i try "modify" this from working with that am5x86 cpu to a normal 486dx2-66, i wont start so im doing something wrong and from those bad pictures i dont seem to hit it correctly.. thats why i hope someone else has a working 486dx2 and can share settings with me..

I guess the only way to make a DX2-66 not booting is to either set externally 50MHz (I assume at 40MHz it would still boot)
or to set the voltage to 3.3V or 3.45V when it is a 5V cpu

found my error, seems 123 on jumpers 9, 10, 11 is with 1 up on drawing 😉 so when i reverted i got the magical 486dx2-66 and booting with it.

thanks a lot for helping out

/Jan