Well I just found it, and I couldn't believe it. I'm going to look at Gerard's original source for the VAX and see what he does on divide by zero.

On Jan 27, 2008, at 1:05 PM, Skip Tavakkolian wrote:

The code led me to confusion, so I just decided to use wordaddr. It
works properly now,  and my Pico is now up at /n/sources/contrib/
pietro/pico9.tgz (note the 9). Details are in README.Plan9, test
files are in /lib/face/.

some book examples are failing:

cpu% 8.out
1:      new[x,y] = x % y
8.out 181613: suicide: sys: trap: divide error pc=0x000023fd


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