I rewrite a DBase IV Application into VFP5 running under NT Workstation 4.0. PCs' config is P133,32Mb,2G HDD. Two barcode reader works perfectly with DBase IV App on a 486 PC for last two years.
With the new VFP5 App and PCs, everything is running OK except the two old barcode readers sometimes reads wrong data. Is it a hardware or software problem? What should I check? Any help would be appreciated.

S H