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

[jdaggett at gate.net]

Boisy

512K x8 is easy to do now via a cartridge.  A single 512Kx 55 nS 
sram is $10. Add a backup battery and you  have some more 
memory. Even the Dallas NVRAM with RTC is cheap compared to 
20 yrs ago.

james

On 6 Sep 2005 at 21:27, Boisy G. Pitre wrote:

From:           	"Boisy G. Pitre" <boisy at boisypitre.com>
Subject:        	Re: [Coco] Re: [Color Computer] Is this likely to work ?
Date sent:      	Tue, 6 Sep 2005 21:27:35 -0500
To:             	CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
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> 
> On Sep 6, 2005, at 7:12 PM, Neil Morrison wrote:
> 
> 
> >
> > 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.
> >
> 
> One thing that comes to mind from Phill's idea is a large RAM Disk.  
> There was a similar product back in the 80s for the CoCo 2, I believe 
> it was called the J&R Banker or something similar?
> 
> Of course, a cartridge based battery-backup RAM disk would also be 
> nice.  CRC's Tony Distefano had a 256K and 512K model, and I myself 
> have the 512K one.  With today's RAM, you could easily support 
> megabytes of RAM space.
> 
> The possibilities are fun and endless...
> 
> Boisy
> 
> 
> >
> >
> >> 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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