>> ...  although I also found ... a small bottle of white powder marked
>> "KNO3"...
> 
> A little charcoal and sulfur and *you* *are* *in* *business* *!*

And why did you *think* my dad had this? ;-)

>> We also found a box containing more 14-pin DIL sockets then it is 
>> humanly normal to have. And a bunch of 7400-series chips. In 
>> particular, these are the original, obsolete, 7400 chips. 7400, 7408, 
>> 7402, etc. Not 74LS00 or even 74S00, but vanilla 7400 TTL. They're 
>> that old.
>>
>> We also found a stack of unopened boxes containing LEDs. Now when I 
>> was at Maplin I bought a bag of mixed LEDs - which is great, because 
>> you get a lot of LEDs for not much money, but OTOH they're all 
>> different. Now I have a matching set!
> 
> Good.  Now you should be able to build a small, functioning processor. 
> With pretty lights to show the data states.

Negative.

I tried to solder the LEDs to a board, but for reasons beyond my 
comprehension, there's a short-circuit somewhere. I've checks and 
re-checked the board. I can't see the short. But there is one.

I think I need to go buy some solder that isn't 30 years old...

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