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  #1  
Old 01-08-2006, 02:19 PM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Wall of RAM
Date: 1 Jan 2006 19:25:50 -0800
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A while back on ebay I was just looking around and came upon 50,000
LEDs.

Ebay is a dangerous place, I can understand how women go to the store
and spend $800 window shoping.

$300 later and I have 50,000 LEDs in the mail

Anyway, I gave away around 1,500 to friends. I still have MANY of them
left.

I thought a "fun" project would be to create a "Wall of RAM". Now it
would be fairly easy to emulate the ram and display the results on the
wall using a CPLD, but what about actually making real ram?

Does anyone think its possible to use capacitors and high current
drivers to use the LED+capacitor combination as ram?

The goal of the project would be a wall of cards, say 4k of ram max.
This wall of ram would interface to either the Altair that I bought OR
the Apple 1 kit that I bought on ebay.

What do you guys think? It seems that with some RAS/CAS decoding logic
that it shouldn't be too hard. The cons of this project are the cost
of 4,096 capacitors and PCBs. The pros of the project are, well, it
would look really neat.

Tell me what you think.

Grant
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  #2  
Old 01-08-2006, 02:19 PM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 1 Jan 2006 19:42:51 -0800
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Well, in the excitement I forgot that 4,096 bytes is 32,768 bits. A
little out of my range.

So maybe we settle on 1k of ram. I don't think I have 32,000 leds of
wall space to spare!!!
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  #3  
Old 01-08-2006, 02:20 PM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
Newsgroups: sci.electronics.basics
Subject: Re: Wall of RAM
Date: 1 Jan 2006 21:28:13 -0800
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On second thought, a 1k ram wall would be 121x121" square. I just got
done drafting it. I think maybe I should consider one 256 byte array
and see how it goes.

What considerations will I have to make for wire length? Possibly use
a differential transciever set?
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  #4  
Old 01-08-2006, 02:20 PM
Grant Stockly Grant Stockly is offline
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Subject: Re: Wall of RAM
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On 2006-01-02, logjam <g...@cmosxray.com> wrote:

> On second thought, a 1k ram wall would be 121x121" square. I just got
> done drafting it. I think maybe I should consider one 256 byte array
> and see how it goes.

when you said 4K I thought you meant bits. and that it sounded possible
but lots of work.

> What considerations will I have to make for wire length? Possibly use
> a differential transciever set?

reduce the clock speed until it starts working?

Bye.
Jasen
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  #5  
Old 01-08-2006, 02:20 PM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
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Subject: Re: Wall of RAM
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All right, I'm not crazy any more. If I even try this I'll just use
some dual port sram and fake it. That should be easier and allow a
switch to choose which 1k bank of the memory to look at. A little more
flexible.
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  #6  
Old 01-08-2006, 02:21 PM
Grant Stockly Grant Stockly is offline
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"logjam" <g...@cmosxray.com> wrote in message
news:1136203193.354765.163350@o13g2000cwo.googlegr oups.com...
> All right, I'm not crazy any more. If I even try this I'll just use
> some dual port sram and fake it. That should be easier and allow a
> switch to choose which 1k bank of the memory to look at. A little more
> flexible.
>

How many lights/led's would that be? Calculating your original thoughts
showed scary amperage and blinding candle-power. I could be wrong, just a
thought.
Bart
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  #7  
Old 01-08-2006, 02:21 PM
Grant Stockly Grant Stockly is offline
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From: "logjam" <g...@cmosxray.com>
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Subject: Re: Wall of RAM
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I don't know. These aren't very bright LEDs.

Here is what 1kbyte would look like:
http://media.diywelder.com/images4/060102-1kvisual.jpg

and a 1 to 1 scale:
http://media.diywelder.com/images4/0...visual1to1.jpg

You may think its crazy...but what am I supposed to do with my 50,000
LEDs???
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