As to the chips on the cartriges, it's true. I have an (antique) HP officejet d145 and the printer remembers the last three cartridges it's seen. So I keep a refill kit and a stable of four cartriges , black and tricolor. Tedious, but economical. By the way the printer calculates not just how much the cartridges have been used but how old they are as well when determining whether or not a given cartridge is "used up". *sigh*
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Be Just and Fear Not.
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