[sdiy] transistion from 7489/74189 to more modern ram??

[dan snazelle]

thanks everyone!

by the way, those BYTE magazines are AMAZING!

were there other magazines from that time that had so much info on hardware? articles from lancaster,etc?

wow



On Dec 15, 2011, at 12:27 AM, James Patchell wrote:

>    Not to mention how power hungry those old TTL rams are.
> 
>    The main problem you are going to confront is SIZE.  The 74LS189 was a 16 x 4 ram.  These days, jelly bean rams are up in the 1M x 8 or 16 in size.  If your project only requires a small amount of memory, you will most likely be "wasting" a lot of memory.  Although, the price will probably be lower.
> 
>    What you are going to want to look for is CMOS ram.  A google shearch should reveal your choices.  Places like JAMECO sell this sort of stuff, or did.  And the rams are just as easy to use as the old 74LS189.
> 
>    Depending on what you are trying to do, you also might want to look into using an FPGA.  The xilinx spartan series has large ram blocks (512x32) or small ram blocks (16x1).  This is what I used to use for my digital projects.
> 
> -Jim
> 
> 
> On 12/14/2011 12:56 PM, dan snazelle wrote:
>> I have bumped into a few projects recently that implement TTL RAM.
>> these RAM chips are extremely straight forward compared to later RAMS i have seen.
>> 
>> however, they are RARE and expensive.
>> 
>> So I was wondering if anyone had advice on a relatively easy to get RAM chip that isnt too hard to use?
>> 
>> also...if anyone knows of a book out there that has a more in depth study of RAM and how to use it than the CMOS cookbook, I would be grateful.
>> 
>> thanks!
>> 
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