Firstly I would like to thank everyone who answered my question, the
answers taught me some interesting tricks.

However I didn't make myself clear enough (being sick/lack of sleep and
generally dumb muddles the brain. :-() in my first message so I'll try to
explain what I'm doing and hopefully it will become clear.

What I'm trying to do is scroll one alphanumeric character across a 5x7 LED
matrix.  The bytes returned from the lookup table are structured as follows.

The bottom 5 bits of portB (16F84) are connected to columns 1 to 5 of the
display.  The upper 3 bits drive a 74138, 3 to 8 line decode which drives
rows 1 to 7 of the display.  To display a character all I do is just keep
on looping and sending out the 7 bytes needed.  As you can see, the top 3
bits can not be touched as they control wich row to light.

Now to make a character scroll across the display I need to shift the 5 bit
value in starting at bit0 through to bit5 and out.

Hopefully this explanation is a little easier to understand. :-)

Regards
Jean-Michel.

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