Re: 30B/34s - adding more RAM Message #5 Posted by robert rozee on 12 Apr 2011, 11:11 a.m., in response to message #4 by Tim Wessman
Quote:
The 10bII+ screen is only using some 130 or so of the available pixels, so unless you want even less information it isn't ideal.
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Also, why use RAM when flash will use less power overall?
flash has a limited (though admittedly large) lifetime wrt write cycles, and will consume more peak current (i'm assuming) when carrying out these writes. in a device powered by a couple of button-cells, any operation that draws a higher than average current, even for a short duration, is of concern - one may end up in the embarrassing situation where the cells fail to have enough 'oomph' to ride through the flash writes long before they are otherwise exhausted. and a failed write flash will lead to... corrupted contents. a bad thing in anyone's books.
the down side of SRAM is the backup current, but for the OnSemi devices this is a somewhat negligible 1uA maximum. assuming a very conservative 30mAh of total capacity, this would be good for nearly 3 1/2 years of backup.
the 12-digit 7-segment display is no worse than that of the hp-15c, which is only 10 digits. and the 10bII+ also has more keys (40) available than the 20b/30b (only 36). hmmm, as i write this i am thinking, "will we see an hp-15cII+ released in the same format/case as the 10bII+?".
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