Date   : Thu, 20 Oct 2005 23:37:02 +0100
From   : "Colin" <cwhill@...>
Subject: Re:

Ah now that's an interesting thing. That may be the cause of my problems
with my BBC-B as discussed (at length) in previous threads.
While fiddling around I removed a sticky label (well, a bit of tape) off
one
(there was a little shiny square thing under it) and I did this in front
of
a sunny window. Of course I have no way of finding out but it would expla
in
why it' no longer working I suppose :-(
Oh well, live and learn.
Colin Hill
----- Original Message ----- 
From: "David Harper" <dl.harper@...>
To: <bbc-micro@...>
Sent: Thursday, October 20, 2005 11:10 PM
Subject: Re: [BBC-Micro]


> Peter Craven wrote:
>
> > 2. My Solidisk EPROM burner does not burn EProms? I
> > have been using the correct size EPROMS and correct
> > orientation when I insert them. I have been following
> > the instructions re: when to turn Vcc and Vpp on, etc.
> > The lights do come on! The EPROMs are old though. Am I
> > supposed to pulll off the sticky cover over the EPROM
> > window when I try to burn one? Can you just keep
> > burning over the same EPROM, or do you require a new
> > one every time?
>
> The "E" in EPROM stands for "Erasable". The idea of them is that if you
want
> to re-program one you first erase it, then you program it with the new
data.
> The EPROM burner only performs the second of these tasks - you cannot b
urn
> it without erasing it first.
>
> To erase one you have to shine UV light on it. (The sticky cover is to
> prevent it being accidentally erased by exposure to sunlight, etc.)
>
> It is easiest (and safest) to erase them using a dedicated EPROM eraser
,
> which will supply the right intensity and wavelength of UV for a timed
> interval. (It takes about 10 minutes.) An eraser would set you back abo
ut
> £50 new, but you should be able to get one off eBay for a lot less th
an
> that, or else get a friendly electronics shop to do it for you.
>
> David Harper
>
>
>
>
>