with the Fpu you have 2 choices,get one that matches the cpu speed or get one at any speed and add a matching crystal(dont forget to set the jumpers).
Yeah, and don't go off othe speed of the CPU, look at the crystal (silver 4 pin "box" right next to the empty socket). The 28MHz. version is aparently using a 20MHZ. 030 that is overclocked.
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