Date   : Tue, 10 Aug 2004 13:41:20 +0100 (BST)
From   : Brian Widdas <brian@...>
Subject: Re: ROM Burning

On Tue, 10 Aug 2004, Chris Priest wrote:

> Hi All,
>
>
>
> Blimey, my second question in two days :-)  Sorry about this, but I've tried
> and tried and can't make it work, so I'll ask
>
>
>
> Trying to burn rom images, I've got myself a willem programmer for the PC,
> not a been one unfortunately, would like one of those, but so incredibly
> hard to come by.
>
>
>
> I have a selection of 27C256 roms OTP version, I thought I would be able to
> use these, but although it burns OK, the rom is not recognised.
>
>
>
> Do I need to offset the data by anything before burning?  Or is it not
> possible to use 256's in a beeb? The rom image is only 8k.

Try blowing the image into the top 16K as well as the bottom. It could be
that the extra address line on the 256 is either floating or set high (I
can't remember off-hand, and I don't have a circuit diagram handy).

Brian
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