drive/rpm3

[dirkwhoffmann]

From the README file:

This directory collects programs that measure the drives spindle motor speed in
RPM.

The result should be somewhere around 300rpm, +/- 1% (297-303)

All programs show on screen:

- the number of cycles measured for one revolution (~200000)
- calculated RPM (highest precision, not rounded)
- calculated RPM (rounded to two decimals)

[...]

rpm3.prg:
- Inspired by "1541 Speed Test" by Zibri (https://csdb.dk/release/?id=194046).
  Writes a test track on track 36, which contains one long SYNC and then 5
  regular bytes. Time for one revolution is measured by reading 6 bytes.
 

Note: The other two test show that the drive rotates at the right speed (slightly slower than VICE). Therefore, the bug affects the measuring method, not the measured parameter.

[dirkwhoffmann]

A quick look at track 36 reveals that the it is full of 1's. Seems like the test fails to write the 5 regular bytes.