Turned out my issue was due to some damage my arduino suffered during a previous project. Picked up another one this afternoon and everything is working fine now.

hi all. UnaClocker, I bought your last 1.0 board on tindle and it seems not to be working properly.
I read the attached EF.bin file out of a 27c64, and i can write it back to a 28c64 but it seems mangled somehow.
when I write the 8k,.bin file I get ~1000 bytes different using verify, the sections at ...