Re: TI-H: REAL Internal Memory Expansion
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Re: TI-H: REAL Internal Memory Expansion
Check out the links I gave. The one for Z80 has some info on it I think...
>Got that part. how would you implement this on the calc? just looking at
>how i would use it as a programmer.
>
>
>At 04:19 PM 10/7/98 -0800, you wrote:
>>
>>Manages your memory.
>>
>>
>>>software mmu? explain. what is an mmu.
>>>
>>>
>>>At 04:03 PM 10/7/98 -0800, you wrote:
>>>>
>>>>>This sounds pretty awesome, but one thing:
>>>>>The DRAMs will need to be dynamically refreshed, which will put one
>hell of
>>>>>a drain on the battery.
>>>>
>>>>For 8MB it is 120mA. Also, you only refresh the areas in ram which contain
>>>>data. That could mean the first 100k only gets refreshed... Not too bad.
>>>>20mA.
>>>>
>>>>>Also, they wil need to be refreshed even when the calc is off.
>>>>>Plus, this would still neeed to be implemented through the link port,
>cause
>>>>>the 32k ram internally is the limit of its capabilities for direct ram
>>>access.
>>>>
>>>>Nope. Use a software MMU. Do you think I'm doumb? :P
>>>>
>>>>>it would be like a e2 that requires constant large amounts of power, is a
>>>>>whole lot bigger, and can be writen to as many times as you want.
>>>>
>>>>I know exactly what it is. If I didn't, I would ask. Gee... DRAM is sooo
>>>>simple.
>>>>
>>>>>At 02:37 PM 10/7/98 -0800, you wrote:
>>>>>>
>>>>>>I've been looking at specs, and its possible to replace the internal SRAM
>>>>>>with DRAM. Then we could have 16MB accessable to our calcs at any time.
>>>>>>
>>>>>>Not too hard either.
>>>>>>
>>>>>>
>>>>>>
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References: