Ivp,

> More than likely a read-modify-write issue
>
> http://www.piclist.com/techref/readmodwrite.htm
>
> As Bob suggests, separate the port bit instructions
>
> Here's an illustrated example of how a h/w problem can be caused
> by s/w that is too fast (especially on the PIC-like Scenix)
>
> http://www.sxlist.com/techref/scenix/sxrmw.htm

It is separated and was working earlier on 16c54's.

If I find a solution, I will post it.

Cheers

Ravi
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