I was just wondering if there is a version/derivative of Knoppix which works like a diagnostic CD:

i- provides system information (processor, RAM, devices, etc.
[after all most of this information is displayed at boot time. how to access this once the system is booted?]


ii- runs tests like memtest, cpubenchmarks, video tests on demand
[one of the cheat codes in the latest version (3.4) has memtest]


Is there such a beast out there?