Re: TI-H: REAL Internal Memory Expansion


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Re: TI-H: REAL Internal Memory Expansion




Flash ram is $9 per MB.  DRAM is $9 for 16MB.

SRAM is a POWER HOG!!!

There are very new low power DRAMs out there...  120mA is very low for
64MBit.  Beleive me...


>How does FlashRAM compare to DRAM and SRAM?
>
>-Miles Raymond
>
>-----Original Message-----
>From: Grant Stockly <gussie@alaska.net>
>To: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
>Date: Wednesday, October 07, 1998 7:21 PM
>Subject: Re: TI-H: REAL Internal Memory Expansion
>
>
>>
>>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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