I just tried assembling those files and it all assembled --- except for the
lines in the p18math.asm file which consist of CLRW. These produced an error.

Both 6.40 and 6.30 failed to assemble this.  These *did* assemble when I
first tried last year. I think I was using something like maybe 6.10 back
then...

The CLRW instruction is not included in the instruction set as listed in
the PIC18F452 data sheet; however it *did* assemble in the past.  Something
does indeed seem to have changed.

You can use the work-around others have suggested to get the code to
assemble but it might be illuminating to consult M'chips support on this
one...

Good luck!
Tom

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