> What is the read-write-mod bug you speak of?

What Lawrence said

http://www.piclist.com/techref/readmodwrite.htm

A pretty nasty real-life example that kept me occupied for a day

http://home.clear.net.nz/pages/joecolquitt/sx_pins2.html

(setb = bsf,  clrb = bcf). Note how the problem simply disappears
when NOPs or shadow regs are used

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