CPU mining works great on 9 years old Japanese cat bed heater made by Fujitsu... Getting about 1 ETN a day... I got 11 ETN on first day of mining with it and my 8 years old Chinese media PC made by Lenovo together.
Selecting the correct pool is essential for mining with toasters and other prehistoric machines. Some pools give 0-0.03 ETN per found block and others give 0.19-2.00 ETN per found block at about 4-8 hashes/second.