On Thu, 5 Aug 2010 20:29:50 +0930, you wrote:

>Just an update,
>
>I spent ages chasing around the city looking for someone with a programmer=
=20
>and eventually found someone.
>
>Raced around to his place and programmed one to start with  ...  plugged i=
t=20
>into the target, and it worked. Phew!!!
>
>Burnt the remaining nine, checking as we went, and all worked but one  ...=
=20
>and that one had come loose in it's holder.
>
>So, it has obviously been a problem with my programmer all this time. Now =
I=20
>just need to work out what's wrong with it. At least it has nothing to do=
=20
>with the eproms, the erasure process, or the target boards.
>
>The guy with the programmer was a computer tech some years ago, and has a=
=20
>dedicated system with an old 486 with no hard drive, just a floppy. Reckon=
ed=20
>he'd only burnt about 20 devices in all the time he's had it. Now it's=20
>probably worn out  ...  it's done 30.
>
>Thanks for all the suggestions and help along the way.
>
>Regards,   Roger

Just a thought - maybe there is an obscure setting somewhere, or library er=
ror in the device size
that meant it was only programming part of the chip - this would explain it=
 verifying OK.
Reading a 'bad' chip on a known good programmer would probably make this ob=
vious.=20

--=20
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