SHAKER is a program designed to run on CPC machines produced by AMSTRAD in the 80s-90s. 
The objective of this program is to carry out extensive tests on the video circuits of this machine. 

https://shaker.logonsystem.eu/

For any information relating to the Compendium and Shaker, you can contact Longshot (Serge Querné):
logon.system@free.fr 