Have you used your calculator for something that was not really math related?

[ijabbott]

(03-02-2019 01:15 PM)Maximilian Hohmann Wrote:  Now the cassette players of the time had non-linear tape counters. There was no 1:1 relation between the playing time of the music and the counter.

AFAIK, the compact cassette has a constant tape speed of 1+7/8 in/s (4.7625 cm/s) so the tape counter ought to be geared from that. But the linear relationship between time and change in counter value would reasonably vary between models.