Author: AHelper
Posted: 30 Oct 2012 03:05:29 pm (GMT -5)
I think you are missing the obvious. Look at a laptop. What one easy thing that you can do to kill your battery? Turn up that brightness. Yup, the light for the monitor is a major power drain compared to the rest of the hardware. What's another major battery killed? Keeping the CPU at the designed speed.
Casio is very smart. They know that the average person doesn't want to buy batteries every week or month. They underclock the CPU (note: CPU was designed to run much faster. What we do is not overclocking, but remove underclocking restrictions. Attempts to actually overclock the SH7724 results in hardware errors and a lockup. According to Renesas and the Linux kernel, when you say "94.3MHz", it is actually ~450MHz for the CPU clock, but the calc is limited from the other clocks being lower). The brightness being limited is a must as you probably wouldn't buy a calc that has absolutely terrible battery life and can't survive on USB power (by OS).
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I sleep under a pillow and stick my tongue out at TI! °ᴥ°
Posted: 30 Oct 2012 03:05:29 pm (GMT -5)
| gbl08ma wrote: | ||||
I don't know but I suspect there's a reason why the maximum backlight level set by the OS isn't 249, but rather something around 140. It may be a reason similar to the one why the default CPU speed isn't 94.3 MHz but 58 MHz - some hardware is incompatible, and there may be higher component wear-out at higher CPU speeds. |
Casio is very smart. They know that the average person doesn't want to buy batteries every week or month. They underclock the CPU (note: CPU was designed to run much faster. What we do is not overclocking, but remove underclocking restrictions. Attempts to actually overclock the SH7724 results in hardware errors and a lockup. According to Renesas and the Linux kernel, when you say "94.3MHz", it is actually ~450MHz for the CPU clock, but the calc is limited from the other clocks being lower). The brightness being limited is a must as you probably wouldn't buy a calc that has absolutely terrible battery life and can't survive on USB power (by OS).
_________________
I sleep under a pillow and stick my tongue out at TI! °ᴥ°