On Tue, 21 Jul 2009 11:29:04 +0000, Geoffrey S. Mendelson wrote:

As the ink gets used, the computer updates the chip with the amount
left by subtracting about what it thinks was used.

Aha! Reminds me of laptop battery "charge remaining" estimators.

Thanks much!

Argh -- lawsuits, no less. Although the **AA are almost (?) terrorist
orgs., I don't consider ink cart. vendors to be quite as bad.

--
Nicabod =+= Waltham, Mass.