Well I have 3 different chips, 1 is soldered on to a M100 option rom adapter board, and so to program it you need to use another adapter board to puts the pinout back to normal. Which I have, but both the option rom adapter and the matching programmer adapter are new untested designs, I was trying to test them now. So you could disregard that one, except it's interesting that it also behaves the same as the the others.
The other 2 are still bare with no suspect adapters. The soic28 to dip28 adapter that came with the programmer is not directional, so I tried flipping it around both ways in case maybe a leg was bad in the adapter. The programmer itself seems to be ok since I've been burning other things with no problem. Thus mystery On May 19, 2016 7:26 PM, "Stephen Adolph" <[email protected]> wrote: > A6? > > 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
