Yes they do, which is why I apparently need 2 of each cartridge if I refill them myself.
The printer remember the last cartridge installed but it forgets it if I install another cartridge. Basically, it only remember using the last cartridge installed so 2 on rotation should work. I hope....
I showed my mother the LD cartridges so when we run out of ink we will pickup the LD set.
Unfortunately, I only have 2 blacks and cyans so I need to cough up for a genuine yellow and magenta.....
I don't print much my self so I would not know. But I wonder if there is a way to spoof the chip and refill them.
Like reset them.