[BBC-Micro] Reversing the Tube ULA (destructively)

Paul Asin station240 at hotmail.com
Tue Oct 26 02:50:53 BST 2010

On 24/10/2010, at 3:16 AM, Ed Spittles <percy.p.person at gmail.com> wrote:

> Has anyone a tube chip (working or not) which could be depackaged and
> photomicrographed so we can conjure up a transistor-level netlist and
> a simulation of it?
> Sacrificing a non-working one seems like a good first step - probably
> that'll be fine for this purpose. Because the Tube is a ULA, we should
> only need the metal pattern, but if it's packaged in plastic we will
> need to get the acid out.
> Ideally someone with a spare tube chip lives near enough someone with
> a suitable microscope and someone with a suitable chemistry set!
> Otherwise I can mail one to Greg James in California.

One problem, there are actually 3 different versions of the TUBE chip. One is the original 6502 cheese wedge, one is for the 6502/80186 internal copros (pn: 2201,266),I forget what the 3rd one is.

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