EmuZWin is one of the fastest and correct among other windowed emulators.

• spectrum models (including exact timing - multicolor):48k, 128k, Pentagon, Scorpion ...
• file formats: tape (tap, tzx...), disk images (TRD, SCL, HoBeta,UDI, FDI)
• devices:disk OS Beta128 (TR-DOS), microdrive (Interface-1), tape; AY, Turbo-AY, Covox, Stereo-Covox, ZX Printer
• map builder
• record videos
• effects: GigaScreen, Snow