[MESS 0.143.]
I've found problem with Dendy Classic emulation:
Length of vertical blanking after NMI = 70
[WRONG] ; 20 is correct
Post-render blanking lines between end of picture and NMI = 1
[WRONG]; 51 is correct
Complete & correct info here:
http://wiki.nesdev.com/w/index.php/Clock_rate (look at "Dendy")
http://wiki.nesdev.com/w/index.php/CPU (look at "PAL Famiclone")
http://nesdev.parodius.com/bbs/viewtopic.php?t=5070 (if you wanna see oscilloscope tests)