the problem with that is you cant ever count "down" with the ROM part
IE you cant make a 1 into a 0
so its a tally style counter
it'd show a "highly visible" passage of time.

I like the idea of overloading blue led's well if you can get them to
explode
the "game theory" of seeing the explosion would be an instant winner ;->
another thaught to "lengenthen" your fuses, theres no reason they have to be
a straight line.

make a double spiral, IE spiral in to the centre and back out again.
for extra credit taper the track vs length to try and get the biggest
"explosion"
possible.

Bill had a good idea wrt that magnetic display though.

you can get magnetic display film, use a capacative discharge pulse to
magnetise a
small peice of iron under the film and you can then do binary counting or
just fire
each one once.

not as spiffy looking as the one that explodes though, it seems to be an
indicator of
life passing, not just time.


> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of William Chops Westfield
> Sent: Sunday, February 05, 2006 19:26
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] MPROM
>
>
> On Feb 4, 2006, at 9:13 AM, Peter Onion wrote:
>
> >>
> >> http://petertodd.ca/persist/2006-02-04/mprom_front.jpg
> >> http://petertodd.ca/persist/2006-02-04/mprom_back.jpg
> >
> > Isn't this just a degenerative form of "diode matrix ROM"
> > Hardly a new idea I'm afraid !
>
> I agree here.  Without the requirement of electrical programability,
> you've just got a plugboard variant.
>
> Hmm.  I wonder if you can combine a hall sensor with one of those
> mechanical/magnetic displays to get the sort of visible programmable
> memory you're looking for.  A sort of visible core memory, modernized.
> It would probably be pretty tough to construct 1000s of bits, though.
> (why did you say you wanted thousands of bits?  You know that about
> 300 bits is sufficient to count the total number of particles in
> the universe, and 64 bits of seconds (or even milliseconds) will
> count essentially forever...)
>
> BillW
>
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