Rotate count out of range

A shift or rotate instruction has been given a second operand that is too
large. For example,

   P8086
   shl   DL,3   ;error, 8086 can only shift by 1 
   P286
   ror   ax,40  ;error, max shift is 31 

The 8086 processor only allows a shift count of 1, but the other
processors allow a shift count up to 31.