for use with Windows 10 64Bit i have test a lot of TTL changer. Nothing work PL2303, CH340 :-( I have test a lot if chips (Fake and normal). Only the FT232 Chip work perfectly - see attached picture (you can copy with this info in avrtx.cn and other foren). In germany, i have buy the FT232 from www.reichelt.de DEBO USB2UART 3 Entwicklerboards - USB Typ-A auf UART, FT232 The rest software works with copy DLL, OCX to Windows 32 or 64 System - so Windows 7 ... All ok :-) i hope, when you can write this Info down, a lot of people are help. Because the cable, i have buy a Mini B USB to connector - see picture. So very nice to Jump:-) Best regard from Germany Mit freundlichen Gršč?en Marco Dittmann 73 DL9AM @ DB 0 OHA und DB 0 YZ