[Coco] 256K RAM chips

[jdaggett at gate.net]

On 27 Dec 2008 at 20:54, jdaggett at gate.net 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

Correction and addition

The stock GIME chip only outputs 18 bits of address. Also the GIME sees the stock 512K as 
256Kx16 configuration. Therefore you will have to put your SRAMs into a 256Kx16 or two 
banks of 256Kx8.

james