Are your chips DIP or PLCC? I ask because if you are using PLCC chips with an adapter, you may have the wrong adapter. The pinout relationship between DIP and PLCC is different for the 512Kb chips than it is for the 1 Mb chips. So a 32 pin PLCC to DIP adapter for 1 Mb flash will not work with 32 pin PLCC 512Kb chip. If it's not that, I can't help you. I'm not familiar with the ChipMax. I use a Needham. Oh, in general, make sure you have the correct make and manufacturer specified. Some of the Flash chips have a reset pin which must be tied high or they won't operate. Others don't, so getting the proper make and model selected in your software can be essential to getting your programmer to handle the reset pin properly (if present). Jeff Walther