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In lugnet.technic, Jona Jeffords wrote:
> In lugnet.technic, Brian H. Nielsen wrote:
> > Inspired by the recent pneumatic computing thread I have created some
> > LEGO mechanical memory. It is an adaptation of a possible design for molecular
> > level RAM.
>
>
> <SNIP>
>
> > The molecular level RAM design included multiple bytes stacked up and a
> > method to select which one was being read/written, but it involves additional
> > structure containing flexible rods for which there is no suitable LEGO
> > counterpart. I am working on alternate methods, but I am not hopeful at this
> > point in time.
> >
> > Please let me know what you think.
> >
> > Brian
>
> Do you happen to have any links to the molecular RAM design you are referencing?
> It would be very cool to compare and contrast your excellent model with the
> "real world" counterpart.
About half-way down this page
http://www.aeiveos.com/~bradbury/Authors/Engineering/Drexler-KE/MMaMED.html is
a diagram and short discussion of a possible design for molecular level RAM.
The diagram shows 2 memory cells of 2 bits each and the mechanism to select
which memory cell is being read/written.
In my LEGO version there is only one memory cell, but I have widened it to 4
bits. My black bit-sliders correspond to the sliders labeled 1 & 2, and my red
write-protect rod corresponds to rod 5.
I have not implememted the read/write heads (rods 7 & 8) nor the row-selector
rods (9 & 10).
The read/write rods appear to need to be flexible in order to move through
the gap left between row-selector rod and the bit-sliders. Note how read/write
rod 7 is trapped by row-selector 9 and bit slider 1, whereas read/write rod 8
was blocked by neither 9 nor 2. That 8 is not blocked by 2 is obvious, but in
order for 9 to block 7 but not block 8 implies that 8 flexed to go around 9 and
through the larger gap.
Brian
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