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/usr/share/doc/acm/README.Debian is in acm 5.0-29.

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Version 5.0 of this package was put together by Phil Brooke
<pjb@debian.org>, from sources obtained from:
 ftp://ftp.websimulations.com/pub/download/acm-5.0.tar.gz

The upstream source tarball was repackaged to remove a single bogus
entry that caused problems with the packaging tools.

libgdbmg1-dev is needed for a clean compile from source to avoid a
problem with sdbm.

Re: bug 143297: There is at least one report of acm not working
properly on 16-bit displays.  However, it does seem to work on many.
If you have problems running acm on a particular colour depth, try
using the `-nosplash' switch (added by Debian maintainer), then try it
on other colour depths.  Then add your experiences to this bug report
so it can be fixed.  Thanks!

Also added by the Debian maintainer: a -dis-silent switch: this stops
acm from sending out the DIS update packets.

If you want to see other people, then you need to share the same
-dis-exercise number and make sure that your packets get to each
other.