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 it=
=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. Reckone=
d=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

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