Date   : Thu, 28 Oct 2010 15:00:00 +0100
From   : percy.p.person@... (Ed Spittles)
Subject: Reversing the Tube ULA (destructively)

On 28 October 2010 13:34, J.G.Harston <jgh@...> wrote:

> Theo Markettos wrote:
> > There are imaging and etching techiques to strip off the layers one by
> one,
> > but they require a lot of trial and error... and there aren't plenty of
> > samples to test on.
>
> Chris Smith has successfully done this with the Spectrum ULA:
> http://www.zxdesign.info/book - It's a fascinating read. He
> used up three or four ICs to get the full image.


I hope we'll only need one Tube ULA, but this is the reason I'd like to use
a broken one - they are in short enough supply as it is.

I did find some good ULA info in that book (is there perhaps a sample
chapter online? I know I haven't bought it)

Ed