Re: TI-H: REAL Internal Memory Expansion
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Re: TI-H: REAL Internal Memory Expansion
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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