I have the STK-200 development kit. When I try to program, read, erase, or do anything with an AT90S4434 chip, the ISP software (that came with the kit) responds that the device can not be found. However, if I pull down the Options menu and choose "Advanced" and then disable the signature check, then everything works fine. Have any of you seen this before? Is this a problem with the IC, or is it a problem with the software?
By the way, there are no problems when I use the AT90S8535 chip. I have also used the '8515 and '4414 without incident.
Thanks very much.