🚀 go-pugleaf

I recently acquired a socket 7 motherboard which is unidentified except
for markings near jumper setting descriptions which suggest it may be an
IMI464 or IMI484 motherboard.  Jumper settings are shown for setting the
external clock to 75, 90, or 100MHz (different settings are shown for
IMI464 and IMI484). There are also jumper settings shown for clock
multipliers of 1.5, 2, 2.5, and 3.  A web search of IMI464 and IMI484
turned up a hit at the J. Bond website - they once made motherboards so
named but the documentation they provide appears to be for a later
revision of the MB that had different jumpers.  My MB is marked Rev 0.2.

With the clock rates and multipliers shown, it seems impossible to set
this MB for 120, 166, or other common processor speeds.  And there are a
lot of combinations that make no sense like 90 x 2 = 180.  I've seen
lots of MBs that have clock rates of 50, 60, and 66 which when
multiplied provide all the common CPU speeds but the external clock
rates on this board seem weird.

Is anyone familiar with this motherboard or other boards with similar
jumper settings?  How do I make sense of these settings?

Roger Levy
change 'i3e' in my address to 'ieee'