I just played with this board yesterday (and overclocked a Pentium MMX 233 MHz CPU to 266 MHz)
I don't have a manual, but the jumpers are pretty self-explanatory.
See attached pic - first jumper is used to select the default CPU speed (which will automatically set the FSB and multiplier for that particular CPU), while the second jumper "T75" will lock the FSB to 75 MHz (or, in my case, at 75.99).
Also, about 1.5 inches from the last ISA slot you will see JP7, if you also need voltage adjustments (Auto, 2.1, 2.8, 2.9, 3.1, 3.2, 3.5)
There might also be a way to set the FSB to 83 MHz through SoftFSB, but haven't tried it. Anyway, great board, rock solid stability and very fast (even without an overclock)!
2 x PLCC-68 / 4 x PGA132 / 5 x Skt 3 / 1 x Skt 4 / 9 x Skt 7 / 12 x SS7 / 1 x Skt 8 / 14 x Slot 1 / 6 x Slot A
5 x Skt 370 / 8 x Skt A / 2 x Skt 478 / 2 x Skt 754 / 3 x Skt 939 / 7 x LGA775 / 1 x LGA1155
Current PC: Ryzen 7 9800X3D
Backup: Ryzen 7 5800X3D