Linked by Thom Holwerda on Mon 27th Mar 2006 21:14 UTC, submitted by teigetje
RISC OS "On this day ten years ago, the first prototype StrongARM processor card was powered up by Acorn engineers. The experimental kit managed to run at a cool 228MHz, running software nearly six times faster than the 40MHz ARM710 processors used in RiscPCs at the time. The card, which drew one watt of power, would later go on sale in September 1996."
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1 watt, 228 MHZ
by ntl_ on Mon 27th Mar 2006 22:02 UTC
ntl_
Member since:
2005-07-09

Not bad at all. If someone made an ARM or MIPS laptop today, we could possibly see 10+ hours of battery life.
<p>Way cooler than having a 3 GHZ CPU in my book.</p>

Reply Score: 2

RE: 1 watt, 228 MHZ
by rayiner on Mon 27th Mar 2006 22:40 in reply to "1 watt, 228 MHZ"
rayiner Member since:
2005-07-06

Probably not. With current laptops, the CPU uses less than 30% of the power of the mcahine. Even if the CPU used 0 watts, a laptop would only go from (say) 3 hours to 4 hours. To hit 10 hours, you'd need to reduce power useage by about a factor of three across the board.

Edited 2006-03-27 22:41

Reply Parent Score: 4

RE[2]: 1 watt, 228 MHZ
by Ronald Vos on Mon 27th Mar 2006 23:54 in reply to "RE: 1 watt, 228 MHZ"
Ronald Vos Member since:
2005-07-06

30% is still a lot, compared to what? 5%? I don't know how much the HD and the screen consume tbh. Still: an extra hour or two of batterylife wouldn't be bad ;)

Don't forget, with such low consumption, you could go mad on multi-core/CPU, and a laptop with 4 ARM CPU's (running Linux) would score definite geekpoints.

Reply Parent Score: 2

RE[2]: 1 watt, 228 MHZ
by ntl_ on Tue 28th Mar 2006 20:04 in reply to "RE: 1 watt, 228 MHZ"
ntl_ Member since:
2005-07-09

Well, you'd have to do more than just change the CPU. PDA-style LCDs that don't use power unless a pixel changes state, plus flash instead of hard drives, etc.

It could be done.

Reply Parent Score: 1

RE: 1 watt, 228 MHZ
by kaiwai on Tue 28th Mar 2006 07:41 in reply to "1 watt, 228 MHZ"
kaiwai Member since:
2005-07-06

They did actually sell an Acorn laptop - my old music teacher had one, the battery life was pretty good; applications you needed resided in rom, fast boot and shutdown, heck, even had a PC emulator for basic dos and Windows 3.1 applications.

Reply Parent Score: 1

RE[2]: 1 watt, 228 MHZ
by helf on Tue 28th Mar 2006 18:41 in reply to "RE: 1 watt, 228 MHZ"
helf Member since:
2005-07-06

yes, it was the Acorn A4 laptop.

http://old-computers.com/museum/computer.asp?c=31&st=1

I have a riscpc 700 that I need to get running again. very nice machines.

about multitasking...

The risc os was and still is cooperative multitasking. Not preemptive like most every other OS out there.

Reply Parent Score: 1