Does the data you read back conform with what it should be for the non ff data? Or is that data wrong? Sounds like an address bit is stuck or disconnected.
On Thursday, May 19, 2016, Brian White <[email protected]> wrote: > Any idea why when I try to program an AT28C256E SOIC28, when I read the chip back out, I get 64 bytes of FF, 64 bytes of data, 64 FF, 64 data, ... for the whole chip, with an exception that the very first block of 64 only has 8 or so bytes of data at the end of the 64 byte block. > > I have 3 of the same chips, all brand new from Mouser not ebay. I have used the same programmer and software to burn several other chips with no problem. > > Trying to use the new option rom adapter module. It looks all perfect and now I'm dead in the water because I can't get any of my SOIC chips programmed. > > -- > bkw
