update from today's previous version:- 1571 MFM uses the same disk surface as GCR.
Major update to 5.25 disk surface.
Improved custom speed zone handling. All VICE test repository RPM tests pass.
1571 burst MFM support. All R/W tests of the 1571 system version test 1.2.1 including MFM format and mfm burst write/read/compare pass.