Thanks to all those who made suggestions. In the end I unrolled the loop and
used straight ...

PORTB = 8
PORTB =  9 etc etc
Goto beginning

and the frequency shot up by almost a factor of ten !. So I have included a
delay of 1 uS at each point and fine tuned the frequency by adjusting the
number of points in each cycle. I am well pleased with the  results for the
price of half a 628 port and five resistors. Thanks again chaps ...... John
Kent

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