In reply to:

The problem seems to be that the BPM calculator program, which I licensed so I could get it to output the readings to a file, doesn't like writing a text file longer than 64KB. I don't know why, maybe that's not the case, but it seems to be provoked by the output file size.

...Does it allow you to print the data? If so, why not just print to a file?
-mark

...proud to have owned one of the first Mark I units

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