Bug in Bob Supnik's Emulator!
Ed G.
edgee at cyberpass.net
Fri Mar 27 12:51:31 AEST 1998
As you know, I wrote this list recently about a bug in Bob Supnik's
emulator which manifests when running factor (1).
I've had a chance to do some further research on this, and it seems
to me that the bug is definitely in Supnik's emulator. What do you
all think? Am I onto something? If so, what part of Supnik's code
is probably to blame?
Here's what I've learned so far:
1. factor on Supnik's emulator fails most of the time (see below for
examples).
2. factor works fine on Ersatz-11
2. On the off-chance that I munged the disk images and somehow
corrupted factor, I reextracted virgin images from the tar ball.
factor still fails while running on Supnik's emulator.
3. Peter Turnbull wrote me that factor running on under uv7 on his
PDP-11/23 runs the test case 'factor 6' without error.
Here's what factor does on Supnik's emulator for a variety of values:
factor 6
2
3
17
17 etc.
factor 257
263
263 etc.
factor 263
269
269 etc.
factor 1009 (works correctly)
1009
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