[Coco] 256K RAM chips

[John Eric]

Those UM61-256K-15 are in fact 256Kbit, 32Kx8 Static CACHE RAM chips. I several tubes of those. You might could use them to make a battery backed RAM Cartridge (32K) ??? JE




________________________________
From: "jdaggett at gate.net" <jdaggett at gate.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Saturday, December 27, 2008 7:54:31 PM
Subject: Re: [Coco] 256K RAM chips

On 24 Dec 2008 at 21:40, N8WQ wrote:

> Can you guys tell me if I might be able to use these memory chips in a
> Color Computer 3 project? Any ideas?
> 
> http://exwn8jef.googlepages.com/cocoprojects
> 
> Alan Jones


Not without some means of demultiplexing the memory address from the 
Z-Buss. To achieve the 20 bit address you will need other logic and use the 
RAS/CAS signals to convert the 10 bit multiplexed address to a 20 bit 
address to use SRAMs. 

james

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