In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

While double-sided boards are DIY feasible, you may consider using 3.3volt power to reduce EMI.  If you really want a speed demon, use the Parallax SX-48 Proto Board as it is 4 ply.

The 4 ply reduces EMI problems.

Still, you may pull the 5v regulator and install a 3.3v.  I am not sure if you can locate a 75Mhz osc at 3.3volts though.  The 50Mhz resonator will do fine.  Maybe I am wrong and Parallax's 75 Mhz will work.

But, those extra layers are worthwhile.

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