[Circuit-announce] Logisim 2.7.1 fixes bugs, improves file handling

[C B. <dr....@gm...>]

Logisim, a graphical design and simulation tool for logic circuits, is
now at version 2.7.1. This release's primary purpose is to address
several issue discovered since 2.7.0 was released two weeks ago.

One of the primary bugs addressed in this release is one where a user
could inadvertently change a component's attribute to an invalid
value. The circuit would typically continue to work normally, but when
the file is later reloaded, the file would refuse to load. This
release repairs the cause of the invalid value assignments; and it
enhances the file-loading process so that a dialog box appears
explaining any problems found, and the portion of the file that could
be interpreted is still loaded.

Another issue found in 2.7.0 was in the behavior of the transistors.
In particular, a transistor would "convert" a floating (Z) value into
an error value when told to transmit its source input; now, floating
values are transmitted as floating values.

Besides addressing many other issues besides these, this version also
adds a "Select Location" attribute to the multiplexer, demultiplexer,
and decoder, allowing the user to configure where these components'
select (and enable) inputs are located relative to the component.

Finally, this release marks the introduction of a mailing list where
users can subscribe to hear about new developments regarding Logisim.
We promise that the traffic on this list will average below one
message per month. To subscribe, go to
https://lists.sourceforge.net/lists/listinfo/circuit-announce

Educational institutions around the world use Logisim as an aid to
teaching about digital logic and computer architecture. As a Java
application, Logisim can run on most major operating systems. Read
more about Logisim at http://www.cburch.com/logisim/, and download it
from SourceForge.net at http://sourceforge.net/projects/circuit/.