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I was unable to find any mention of the HP9821 desktop. This calculator looks identical to the 9820 but has a built-in cassette tape drive. Do you have any info on this machine?


I have two of them and one or two others here also have one. That's the only ones that I know of, so they seem to be rare. Check the archives, there was already a discussion about them. Information about them is hard to come by but them seem to be upgraded 9820s that use tape drives instead of mag card readers. They also have more memory than the 9820.