Revision V1.31
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   - fixed a bgrnd refresh bug with the software crsr in 24bit
     mode

 Revision V1.30
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   - A small amount of PicassoII boards was released with a
     CL-5428 chip which has a software crsr bug in 16bit mode
     (the hardware crsr is moved 8 pixels to the left). This is
     now recognized correctly

 Revision V1.29
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   - fixed software crsr problems in 24bit mode with newer cgx
     libraries
   - a PicassoII+ board is now detected correctly. the horizontal hotspot
     position was not set correctly in 15/16bit modes (moved 8 pixels to
     the left). This should be fixed