No it's not, it's quite old and I would have thought technically minded people knew that word. Often used for appliances like washing machine and TVs. I have

No it's not, it's quite old and I would have thought technically minded people knew that word. Often used for appliances like washing machine and TVs. I have a tinkerer friend who call laptop motherboards 'mainboard' to differentiate them from desktop computers where you can actually plug graphic cards and Ram.