You can buy replacement chips and stick them to your existing cartridges, but it seems like an unnecessary hassle (do a web search for "HP laserjet smartchip" and you'll find them).

I don't mean to speak negatively of HP; I'd imagine that other manufacturers have adopted the same practices. But, if you can find a printer without one of these chips, it would probably save you money in the long run.

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1989 250TD Wagon 5-speed, 160,000mi ::: Dark gray metallic / black cloth
1984 190D-2.2 5-speed, 287,000mi ::: Silver-blue metallic / black MB-tex ::: SOLD