Hello,
Does somebody know the jummer settings for fsb speeds 0f 60 mhz and higher?
I only see JP21 and JP22 on my board.
Im guessing SC464 S2 (pin17) is not connected to anything thus reads 1 because of internal pull-up
https://theretroweb.com/chip/documentation/sc … b0905274153.pdf
you would have to
1 check with a multimeter on unpowered computer resistance between SC464 pins 17 and 16, then 17 and 19
2 if resistance is bigger than lets say 1Kohm you can solder a bridge (short) between 17 and 16
3 set JP21 and JP22 for 50MHz
4 hope mobo tolerates 60MHz FSB 😀
5 if no boot set jumpers for 25MHz <- this will result in real 30MHz fsb and computer should power up no problem
https://github.com/raszpl/sigrok-disk FM/MFM/RLL decoder
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module (AT&T Globalyst)
https://github.com/raszpl/386RC-16 ram board
https://github.com/raszpl/Zenith_ZBIOS Zenith Z-386 MFM-300 ZBIOS disassembly
Thanks!