Hi Brian,

Quick reply to your questions.

The application looks good, the only comment I have is on the statement:

> bcf     TRISB & 0x07f, 0        ; Set bit 0 to output
> Here is where I have trouble.  If I understand this correctly,  this
should
> take 00000000 and (and) it
> with 01111111.  Am I right?

Most people would consider this to be 11111110, with bit 0 being on the
right.

Other than that (and it's a nit), the code looks good.

> Another thing I want to know is how can you clear PortB if you don't
switch
> banks first?  I mean according to Mykes book,  which is where I copied
this
> program from, the above code says it is ok to clear PortB, but to set the
> I/O direction, you need to switch banks first.

If you write directly to the Port register, the new value will be saved even
though the port bits are in input mode.  Once the Port register bits are put
into output mode, then the values written to them will be driven out of the
pins.

Does this help explain it?

myke