This is the homepage of jpnevulator. What once started as a Jackpot Navigator emulator (hence the strange name) is now a nice serial sniffer and you can use it to send data on a serial line too. It's sort of like a very simple terminal emulator, like picocom. But jpnevulator uses hexadecimal byte values to display and send along the line. Very handy indeed if you are working a lot with serial protocols.

jpnevulator is released as Free Software under the GPL license. See the file COPYING in the source tarball for more information.

For your convenience you can find the manual page here. If after reading it you have a question, please next read the FAQ. It's kind of a pathetic FAQ file for now, but I bet your question is in it!


These are the (max. 10) most recent news items about the project:

08/02/2019-Is this piece of software finished, like I thought it was in 2011?
More than some years and not much happened. The casual observer might conclude that this project is dead. Well, it's not dead. It's just that I think it's finished for now. I haven't used the program a lot in recent years, but I have always been happy in how it worked. Nothing to improve. But if you feel different, please let me know. :)
I've said something alike this before, back in 2011 and a lot has happened after it. To my surprise a lot of people still use my software. Let's see how goes this time. Please don't forget to send in a postcard. It's much appriciated!!

Select a year and press 'See News' to see some more (old) news:

Example of the output

Below is an example of the output one can see when reading from two serial devices at the same time:

$ jpnevulator --ascii --timing-print --tty /dev/ttyS0:SB9600d --tty "/dev/ttyUSB0:Motorola MTM800" --read
2006-05-30 13:23:49.461075: SB9600d
00 00 05 3B 0D 00 00 05                         ...;....
2006-05-30 13:23:49.461113: Motorola MTM800
00 05 3B 0D 00 00 05 3B 0D                      ..;....;.
2006-05-30 13:23:49.473074: SB9600d
3B 0D 00 00 05 3B 0D                            ;....;.
2006-05-30 13:23:49.473105: Motorola MTM800
00 12 05 06 39 00 12 05 06 39 1F 00 22 80 00 0E ....9....9.."...



Please see for the latest and greatest version of the source code.


The current release of jpnevulator is version 2.3.4, which was released on August 27th, 2016. Download this compressed tarball(37.4K) and see the README and INSTALL file for more information on how to compile the program.

Older versions can be found here.

Debian GNU/Linux

jpnevulator is an official part of the Debian operating system. You can find information about it at

All the ever released packages can be also be found here.


jpnevulator is written and maintained by Freddy Spierenburg. Feel free to send questions, bugfixes and the like to

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