[Coco] Disk speed problems

[Bill Gunshannon]

OK, in my continued effort to revive all my old Tandy stuff
I am cleaning and testing disk drives.  I grabbed something
called "The COCO Checker -- Version 1.0".  Every disk I hook
up speed tests to 573 RPM.  being as some of these came out
of working systems, I'm baffled.  Is anyone familiar with
this program?  Is there something better I can use on a COCO
3 for testing and adjusting drive speed?

bill