cmatrix software package provides 1.2a-5, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install cmatrix
cmatrix is installed in your system.
Make ensure the cmatrix package were installed using the commands given below,
$ sudo dpkg-query -l | grep cmatrix *
You will get with cmatrix package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Miscellaneous |
| Package | cmatrix |
| Version | 1.2a-5 |
| Description | 1.2a-5 |
| Sub Section | Misc |