EPROM Eraser not erasing New EPROM

[93 Formula]

>From: Roger Heflin  <rah at horizon.hit.net>

>Did you read t he chip before you started erasing it?   If so, read it
>again, and save it in a different file, then dump both chips with a
>hex dump program to a file, and use the diff command against it.   >If you 
>have a digital camara you might want to take some pictures of
>the various steps you go through and put them on the web and send me link 
>and I will see if that helps with figuring out what is going on.
>
I just looked at the file it created after erasing it (and putting some tape 
over it) and reading it in. It seems it created big chunks of area that have 
one value like 00 or E1 or 60 or 20 and sometimes there is a couple of pages 
marked 00 but one or two "colums" of hex bytes appear with 01  wierd.
Could I have wrong settings in the programmer?
My program type is set to:  Byte program, eprom=27256 Vpp=12.5v
file type=binary, eprom cksum=0000 start 0000 end=007FFF
I chose #5 on the menu for chip type
When I first started trying to erase it, I was putting the non-eprom chip 
side of the memcal over the light(by accident) for quite a while. Maybe the 
warmth of the light could that have effected it?
The original file I read in to binary and already sent to you Roger.
It was the "BNXF.BIN" file since that was the code on the chip.
I loaded three bin files on the web.(Modified, "Erased" and original)
These are the links:
(In case anyone wants to look at a weird file)
http://homestead.juno.com/fastcars77/files/bnxf.bin 
http://homestead.juno.com/fastcars77/files/erased.bin
http://homestead.juno.com/fastcars77/files/bnxforig.bin
Thanks, Jeff
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