hi still got problem when programming using my brand new vp-490 this time with ST M27C1024 still pragram then somes seconds after start,program fails! note that: -thoses eprom can be programmed on an vp-280 (so its works not bad eproms) -i"m using latest software (02/11/2012) -i"m on windows 7 64 bits and tested on windows 7 32bits too -i"m using CORRECTLY my vp-490,that"s means that i put ac adapter before plugin USB cable and i always use ac adapter thanks for your help
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