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

[Boisy G. Pitre]

On Sep 6, 2005, at 10:06 PM, Glen VanDenBiggelaar wrote:

>
> Since you already have a battery backup, how hard would it be to  
> through a "realtime Clock"? if you had a Cart with a Ram drive and  
> a clock and it was cheap (under $20) itt hink you would have a real  
> hit threre.
> -Glen

Glen,

Sure, an RTC could be put on, as well as FLASH to hold ROM images.  I  
would venture to say that all of that could even fit in a shortie pak  
on a very small cartridge footprint.

$20?  Could be done, but you would  be giving away your time and some  
of your cost :)  Still it's cool to dream about what can be done!

>>
>> 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>
>> Send reply 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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