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'[EE]: Flash ROM Circuit'
2001\11\20@220907 by Linux HA

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I'm in the process of Open Sourcing the Circuit Cellar HCS II (home
automation controller). I need to make it easier for me to upgrade
the code so I'm looking for a circuit which I can build to swap out
the 27256 and drop in a small board with flash on it. I want to be
able to program it via the systems CPU. Any pointers?

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2001\11\20@225542 by David VanHorn

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At 10:02 PM 11/20/01 -0500, Linux HA wrote:
>I'm in the process of Open Sourcing the Circuit Cellar HCS II (home
>automation controller). I need to make it easier for me to upgrade
>the code so I'm looking for a circuit which I can build to swap out
>the 27256 and drop in a small board with flash on it. I want to be
>able to program it via the systems CPU. Any pointers?

Replacing it with a FRAM might be simpler.
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2001\11\21@014054 by Linux HA

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David VanHorn wrote:

> At 10:02 PM 11/20/01 -0500, Linux HA wrote:
>
>> I'm in the process of Open Sourcing the Circuit Cellar HCS II (home
>> automation controller). I need to make it easier for me to upgrade
>> the code so I'm looking for a circuit which I can build to swap out
>> the 27256 and drop in a small board with flash on it. I want to be
>> able to program it via the systems CPU. Any pointers?
>
>
> Replacing it with a FRAM might be simpler.


Simple is good, any pointers?


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2001\11\21@174026 by Barry Gershenfeld

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AFAIK you can just drop it in.  These days the flash ROMs can
be programmed in-circuit, at 5v (or 3.3).  It's just a write
sequence that does it.   Oh, you will need to run the write
signal to it.

The pins are a lot smaller these days, though :)

Barry


>I'm in the process of Open Sourcing the Circuit Cellar HCS II (home
>automation controller). I need to make it easier for me to upgrade
>the code so I'm looking for a circuit which I can build to swap out
>the 27256 and drop in a small board with flash on it. I want to be
>able to program it via the systems CPU. Any pointers?
>
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>Linux Home Automation           Neil Cherry             .....linuxhaKILLspamspam.....home.com

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