Is there such a thing as an MZ demoscene?
My assumption is because I had a CMOS Z80@20MHz plugged instead of the original Z80. I kinda think the clock edge rising/falling are so fast that they could allow one cycle more. So I would say a genuine PAL MZ-700 as yours may have 82 cycles as max. I need to fix EmuZ-700 for both PAL and NTSC again. 82 for PAL and probably 62 for NTSC.