TI-H: Internal memory expansion III

To: ti-hardware@lists.ticalc.org
Subject: TI-H: Internal memory expansion III
From: "marcel groenendijk" <m_groenendijk@hotmail.com>
Date: Thu, 13 Aug 1998 06:05:30 PDT
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org


Sorry, i forgot to answer a question concerning the power consumption 
after modifying the calc, so i wrote yet another message. The answer is 
no, it doesn't significantly draw more current. Of course it does draw 
more current then without a extra RAM, but normally one of the two RAM's 
has it's Chip Select line kept high, which causes it to get into standby 
mode. In this mode normally a RAM draws very little current.
Furthermore there were two messages i didn't get through my mail 
(probably will be sent tonight) so i will answer them now. First someone 
asked if it works on the 83. Same here, i don't know this calc so you 
should look at my previous message concerning the 86. Secondly i was 
asked to write down some chip ID's so here they are: 62256 from samsung, 
the 68257 from samsung and the 71256 from integrated device technology. 
These were taken from a farnell catalogus. There were more, but these 
were the cheapest. Anyway you don't really need to know the chip ID 
because if you ask any electronic shop for a 32K*8 smd Static RAM they 
will most likely give you the correct one. Lastly just watch out for my 
doc which will be made very soon.
See ya,

Neil

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