Re: TI-H: REAL Internal Memory Expansion

To: <ti-hardware@lists.ticalc.org>
Subject: Re: TI-H: REAL Internal Memory Expansion
From: "Miles Raymond" <m_rayman@bigfoot.com>
Date: Wed, 7 Oct 1998 22:21:22 -0500
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org


I meant besides cost.  Wouldn't FlashRAM be more practical?  How many mAs
are wasted on read/writing, compared to how much is wasted every second on
the DRAM?

-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 9:16 PM
Subject: 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.

Prev: Re: TI-H: REAL Internal Memory Expansion
Next: Re(2): TI-H: BLANK LINES!!!
Index(es):
- Main
- Thread