After testing for most of the day, all of a sudden I find myself unable to read or program my ATMega88V's, either using the Dragon with ISP to my project board, or by plugging an 88V into the STK500 board (green socket) and using either high voltage or ISP mode. Both of these worked earlier.
Any idea what could be causing this?
I am using the latest AVR Studio 4.13 with GCC, a (USB) Dragon, an STK500 configured for HV programming, and a 13.6VDC/1A power supply for the project board or STK500.
I have verified that the project board works okay with an early, already programmed part (a 90S4433 - pin compatible).
When I try to read anything using either device, I get either an error or all FF's (except for the flags, which come in non-FF on the STK500 even with no part plugged in!). Programming appears to work on the STK500, but verify fails because it reads FF.
I have tried 4 different 88V's.