[BBC-Micro] Reversing the Tube ULA (destructively)
pete at dunnington.plus.com
Fri Oct 29 17:53:13 BST 2010
Ed Spittles wrote:
> On 28 October 2010 21:21, Pete Turnbull wrote:
> Well, for your edification and delight, I tried an experiment a little
> earlier this evening.
> I am both edified and delighted! However...
> On 29 October 2010 01:02, Mark Haysman wrote:
> I'll keep an eye out for a dead one to experiment on. If we were
> going to
> submit it to a lab for proper deconstruction, I don't mind supplying
> a known
> good one for that.
> This could be the solution! I'd be surprised if no-one on the list has
> a broken second processor - but will anyone be prepared to donate the
> presumed-useless Tube chip? It still bothers me to destroy a working one.
> But also, in your photo of the 3 generations:
> isn't the top one plastic packaged? Would that be depackageable with
All the ones in the photo are plastic packages (and the last two are
really the same chip). Acetone won't affect those much. As I
understand it, in the common decapsulating process, acetone is just used
to wash off the fuming nitric acid; you don't want to use water because
nitric acid that's not pretty much anhydrous will etch away the metal.
Pete Peter Turnbull
University of York
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