[Coco] Re: [Color Computer] Is this likely to work ?

Neil Morrison neilsmorr at hotpop.com
Tue Sep 6 20:12:15 EDT 2005

The question is why and what can be done with this memory? A more 
interesting project would be a combined RAM/ROM card to plug into the 
Multipak under OS-9 which would have, say, 1 Mb of ROM and 1 Mb of RAM. With 
a driver OS-9 could use this to run even the C-Compiler in a fast fashion.


Neil Morrison

----- Original Message ----- 
From: "Phill Harvey-Smith" <dragon at aurigae.demon.co.uk>

> Hi,
> I am toying with the idea of developing some sort of expansion RAM for
> the CoCo 1/2 & Dragons, basically the non-gime machines. I'm just trying
> to bounce the idea here to see if it is likley to work.
> Looking at the circuit sheets for the Dragon & CoCo 1, it seems that
> access to the RAM is mediated by the SAM, and the LS244 buffer on the
> output of the RAM. Also reading the datasheet for the 4164 RAM chip, it
> seems that /RAS is used as a chip enable to set it up to be accessed.
>  .... 

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