[Coco] any interest in an 8MB ram card for COCO3?

[William Astle]

On 10-04-15 03:37 PM, Stephen Adolph wrote:
> The idea would be to do something similar to the big memory cards done
> before, like cocozilla or whatever.    The difference is that no
> refresh is needed.
>
> If Nitros-9 can only see 2 MB, is there much point in doing more?
> Seemed to me that the bytes for control were available - we could
> extend Nitros-9 to address more memory could we (I mean the nitros-9
> team) not?

I would think it would be possible to, at the very least, mangle 
together a ramdisk or other gimmick that uses memory beyond 2MB on 
Nitros. That could be quite useful for a lot of circumstances, actually. 
Given that, the 4MB or 8MB variations could be worth doing.

2MB is easier because the memory block numbers fit in the existing MMU 
register locations. Beyond that needs some additional kludging.

There is also the possibly issue with video screen addresses which might 
need to be addressed. How do other 2MB boards handle that?

>
> ..Steve
>
>
>
>
> On Thu, Apr 15, 2010 at 5:33 PM, Benoit Bleau<benbleau at gmail.com>  wrote:
>> On 15/04/2010 2:33 PM, Stephen Adolph wrote:
>>>
>>> Hi all,
>>> just a feeler here.
>>>
>>> I happen to have a whole pile of static ram parts, 1 and 2MB each.
>>> I also have a whole pile of CPLDs lying around.
>>> Why not make those into something useful?
>>> Anyone interested in a ram card based on SRAM for the COCO3?
>>>
>>> Features-
>>> * plug and play just like the others
>>> * no need for a new refresh circuit (static ram used!)
>>> * low power consumption, nice on the supply
>>> * scalable from 2MB to 4MB to 8MB, as you wish
>>>
>>> Note:  2MB card would use 2 1MB srams, while the 8 MB part would use 4
>>> 2MB parts.
>>>
>>> Price could be something like 80$ for 2 MB, 100 for 4 MB and 120 for 8 MB.
>>>
>>>
>>
>> If this works with Nitros ( at least the 2 MB part) I'm very interrested in
>> it :)
>>
>> -Benoit
>>
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>
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